The Doctor worryingly watched leaning on one of the Y beams as Donna broadly grinned standing beside Rita who watched over the red head as she flew the TARDIS. The Doctor groaned not sure how the Time Lords had managed to get in the situation, that was until he noticed the amused grin on Rita's face, he remembered Donna begging him an hour prior, repeatedly he protested against the idea, that was until Rita walked in on the conversation and sided with the ginger. The Doctor groaned continuing to protest against the idea until the blonde dragging him out of the console room and gave him the puppy dog eyes.

The Doctor tried his hardest to continue protesting until she had him pressed up against the wall her hands running up and down the lapels of his suit staring into his eyes with a mischievous look. Swallowing thickly the Doctor changed his tune agreeing to the idea which then led him to the situation he was now in. That was after he and the Time Lady has ahem, a moment.

"I can't believe I'm doing this!" Donna joyfully laughed. Rita chuckled watching her.

"No, neither can I." The groaned again then hurried over hitting the console with a hammer. "Oh, careful."

"Don't do that," Rita grumbled at him pulling the hammer out of his hand placing it on the floor under the console. "You know she hates it when you do that, no wonder she is grouchy and ignores anything half the time."

"She doesn't get grouchy." He scoffed. "Plus she's completely fine with you!" He protested his voice raising in pitch.

"That's because I don't hit her." She poked her tongue out at him causing him to groan again.

"Left hand down." He instructed. "Left hand down!" He looked at the monitor. "Getting a bit too close to the 1980s."

"What am I going to do, put a dent in them?" She sarcastically asked the Time Lord."

"Well, someone did."

"Yeah about that." Rita scratched the back of her neck. "Knew I forgot something."

"What did you do?" The Doctor looked at her.

"Sarah Jane got bored once and I may have let her fly the TARDIS when you were in the library." She admitted avoiding his face seeing the slightly amused look in his eyes. "I was watching her." She held her hands up. "Everything was completely fine until I looked away."

"Why did you do that?" He raised a brow.

"I was reading a really good book!" She protested again. "Nothing serious happened." She reassured him then opened her mouth to speak as a phone started to ring.

"Hold on." Donna frowned. "That's a phone."

The Doctor and Rita glanced at each other and then at the phone then back at each other, the Doctor took the mobile out of the socket from the console. "You've got a mobile?" Donna frowned at them. "Since when?"

"It's not mine."

Donna looked at Rita raising a brow. "Not mine either." The Doctor answered the phone, Rita leaning in to hear the conversation.

"Hello?"

"Doctor?" Rita heard the voice of Martha and automatically started grinning broadly. "It's Martha, and I'm bringing you two back to Earth."

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The Doctor and Rita stepped out of the TARDIS after it materialised. Martha turned around seeing the two of them and started grinning herself.

"Hello Martha." Rita chuckled.

"Stone." The two of them then hugged laughing. "It's strange seeing you blonde with a welsh accent.

"I've got used to it." She shrugged, Martha then turned to the Doctor.

"Martha Jones." He grinned at her.

"Doctor."

"You haven't changed a bit." He chuckled at her.

"Neither have you."

"How's the family?" He asked.

"You know." She shrugged. "Not so bad. Recovering." The Doctor and Rita nodded.

"What about you?" She asked before stopping. "Right." Martha looked behind the Time Lords noticing Donna standing awkwardly behind them. "Should have known. Didn't take you both long to replace me, then."

"Now, don't start fighting." The Doctor pulled Rita away holding his hands up and standing between the two woman. "Martha, Donna. Donna, Martha. Please don't fight. Can't bear fighting."

"Doctor do you not trust any of your companies?" Rita laughed pulling him to the side as Donna smiled warmly at Martha.

The two shook hands while Rita raised her brows at the Doctor giving him the 'I told you so' look knowing that the two wouldn't fight.

"I've heard all about you." Donna nodded at Martha. "They talk about you all the time."

"I dread to think." Martha groaned a little as Rita chuckled quietly.

"No, no, no. No," Donna shook her head. "They say nice things. Good things. Nice things. Really good things."

"Oh my God." Martha looked down slightly wide eyed. "They told you everything."

"Actually I didn't." Rita raised a hand interrupting the two. "Mister can't stop talking for a single second said it all."

"Didn't take long to get over it though." Donna glanced at Martha's hand. "Who's the lucky man?"

"What man?" The Doctor frowned. "Lucky what?"

"Doctor you really need to start paying more attention." The Stone rolled her eyes. "Martha's got engaged." She grinned at the woman hugging her away as Donna hit his arm.

"You prawn." Donna hit his arm.

"Congratulations Martha." Rita laughed eyeing the ring on her finger.

"Really?" The Doctor looked at her. "Who to?"

"Tom. That Tom Milligan." She replied. Rita nodded knowing who she was talking about having met the man herself in the 'year that never was.' "He's in paediatrics." She informed. "Working out in Africa right now. And yes, I know," she sighed. "I've got a doctor who disappears off to distant places. Tell me about it."

"Now that's practically the story of my life." Rita laughed the Doctor grinning at her wrapping an arm around her waist. "Except I can't leave him alone for a second without him getting himself into trouble." She glanced at the Doctor who then smirked at her pulling her just a bit closer, he knew that her words were very much true, then again she was no better herself they both got into trouble just as badly as the other.

"Is he skinny?" Donna asked.

"No, he's sort of... strong."

"He is too skinny for words." Donna pointed at the Doctor who groaned. "You give him a hug, you get a paper cut, I don't know she puts up with it." She looked at Rita who blushed slightly at the comment before she started to laugh.

"Oh, I'd rather you were fighting." The Doctor grumbled.

"Speaking of which." Martha turned around as the voice of a woman came through from a sort of walkie talkie. "Doctor Jones, report to base, please. Over." Martha reached and held the walkie talkie starting to talk into it walking along. "This is Doctor Jones. Operation Blue Sky is go, go, go. I repeat, this is a go." The Doctor and Rita glanced at each other. They followed Martha glancing around as a convoy of jeeps appeared as a squad of men and woman ran past carrying guns.

"Unified Intelligence Taskforce!" A man shouted. "Raise that barrier, now!" The barrier then raised as the cars entered the factory.

The guards pointed their guns at the workers who crouched to the floor holding their hands to their heads.

"All workers lay down your tools and surrender." A voice said through the speaker.

"Greyhound Six to Trap One," Martha said into her walkie talkie again. "B Section, go, go, go. Search the ground floor. Grid pattern delta."

"What are you searching for?" The Doctor asked.

"Illegal aliens."

"This is a UNIT operation. All workers lay down your tools and surrender immediately."

"B section mobilised. E section, F section, on my command." Martha then ran off as Rita frowned eyeing the guards carrying guns. "They're never a good mix," Rita said the Doctor glancing at her as she narrowed her eyes watching the troops run past.

"Is that what you two did to her?" Donna asked. "Turned her into a soldier?" The Doctor and Rita ignored her question watching more of the people run past.

Martha then ran back to the three. "And you're qualified now." The Doctor nodded to Martha's badge. "You're a proper doctor."

"UNIT rushed it through," she explained, "given my experience in the field. Here we go." She walked on the three following her. "We're establishing a field base on site. They're dying to meet you both."

"Wish we could say the same." The Doctor muttered following Martha into the back of a large black truck.

They walked in to see what looked like a mobile HQ with a load of computers and a man in what looked like army uniform standing up watching the screens. "Operation Blue Sky complete, sir." Martha walked over to him. "Thanks for letting me take the lead. And, this is the Doctor and the Stone." She stepped out of the way. "Doctor, Stone, Colonel Mace."

"Sir. Ma'am." He saluted them both.

"Oh, don't salute." The Doctor groaned.

"Yeah don't do that." Rita nodded in agreement with the Doctor

"But it's an honour, sir, ma'am, I've read all the files on you both. Technically speaking, you're both still on staff. You never resigned."

"Oh, that something else I forgot to do." Rita sighed. "I'm forgetting everything today."

"What, you two used to work for them?" Donna frowned not believing it.

"Yeah," the Doctor nodded, "long time ago. Back in the 70's.

"Or was it the 80's?" Rita frowned in thought.

"But it was all a bit more homespun back then."

"Times have changed, sir, ma'am."

"Yeah, that's enough of the sir." The Doctor remarked.

"Same with the ma'am."

"Come on, though, Doctor, Stone. You've both seen it." Martha said to them. "You've been on board the Valiant. We've got massive funding from the United Nations, all in the name of Home World Security."

"A modern UNIT for the modern world."

"What, and that means arresting ordinary factory workers, in the streets, in broad daylight?" Donna spoke up. "It's more like Guantanamo Bay out there. Donna, by the way. Donna Noble, since you didn't ask. I'll have a salute."

Mace glanced at the Time Lords who gave a small nod slightly smirking when Mace turned to Donna and saluted at her.

"Ma'am."

"Thank you." She smugly grinned.

The Doctor threw off his coat sitting down beside the blonde the both of them looking at the large screen showing a diagram of every country with red dots scattered on it. "Tell me, what's going on in that factory?"

"Yesterday, fifty-two people died in identical circumstances, right across the world, in eleven different time zones," Mace explained to them. "Five a.m. in the UK, six a.m. in France, eight a.m. in Moscow, one p.m. in China."

"You mean they died simultaneously." The Doctor said.

"Exactly." He nodded. "Fifty-two deaths at the exact same moment, worldwide."

"And how did all of those people die?" Rita raised a brow at Mace.

"They were all inside their cars."

"They were poisoned," Martha said the two turned to her listening. "I checked the biopsies. No toxins. Whatever it is, left the system immediately."

The Doctor looked at her. "What have the cars got in common?"

"Completely different makes. They're all fitted with ATMOS," the Time Lords frowned, "and that is the ATMOS factory."

"What is ATMOS?" Rita asked. "What's it do?"

"Oh, come on." Donna rolled her eyes. "Even I know that. Everyone's got ATMOS."

"When you travel in time and space most of the time you ironically don't have time to know about all of the latest things in, plus why would the Doctor need ATMOS? the TARDIS isn't a car." She raised her brow.

The Doctor grumbled a little at her saying it was his TARDIS, no matter how much he said it she never listened when he said the TARDIS was both of theirs.

"Come on," Martha said starting to leave. "I'll show you."

They walked above the factory more UNIT paratroopers rounded up ATMOS factory workers as the Doctor and Rita looked around.

"ATMOS stands for Atmospheric Omission System." Martha stated. "Fit ATMOS in your car, it reduces CO2 emissions to zero."

"Zero?" The Time Lords blinked at her not believing their ears. "No carbon?" The Doctor questioned, "none at all?"

"And you get sat-nav and twenty quid in shopping vouchers if you introduce a friend. Bargain." Donna explained.

"And this is where they make it, Doctor, Stone, shipping worldwide." He looked out onto what looked like a shop floor. "Seventeen factories across the globe, but this is the central depot, sending ATMOS to every country on Earth."

"And you think ATMOS is alien."

"It's our job to investigate that possibility. Doctor, Stone?" He continued walking through passing paratroopers who were moving workers.

"Come on, look lively." They heard a soldier. "Up the pace, go on. We haven't got all day now."

Mace then lead then through a plastic curtain where an ATMOS device sat on a glass table. "And here it is, laid bare." Mace nodded at the device. "ATMOS can be threaded through any and every make of car."

"But I know you lot, as stupid as UNIT can be at times I know you must have checked it before it went up on sale," Rita crossed her arms watching as the Doctor picked up the device examining it.

"We did." Martha nodded. "We found nothing. That's why I thought we needed experts."

"Really. who'd you get?" The Doctor asked as Rita shook her head at him. "Oh, right... Us, yes. Good."

"Sweetheart you just like to show off don't you." She shook her head at him.

"Only in front of you." He smirked winking at her.

"Now's not the time to be a flirt Doctor." The Stone lightly shook her head. The Doctor then followed Martha and Mace while the Stone watched the screen.

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"Martha." The Doctor quickly caught up with the woman. "I know we're all busy at the moment but I need your help."

"My help?" She raised a brow slightly confused.

The Doctor sighed and reached into his pocket bringing out a light grey, almost silver box.

"Is that?" Martha's eyes widened guessing what was most likely inside.

"Yes." He slowly nodded. "And I don't know how to ask."

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"So why would aliens be so keen on cleaning up our atmosphere?" Donna asked the Stone.

"That is a good question." The she hummed.

"Maybe they want to help." Donna shrugged. "Get rid of pollution and stuff."

"Donna do you know how many cars there are on planet Earth?" She asked. Donna opened her mouth to answer then closed as the voice of the Doctor appeared while he walking through the door.

"Eight hundred million." he walked over to the Time Lady. "Imagine that." The Doctor said. "If you could control them, you'd have eight hundred million weapons."

"But why?" Rita frowned looking at the device. "If someone wanted to clean up the Earth's atmosphere why would they use their devices to kill people?" She hummed in thought. "Unless they started to mess with the device, but all at the same time." She paced around the room a little in thought as the Doctor watched, Donna left the two alone going to check the factory.

"I know you dislike it here." The Doctor said forcing Rita to stop in thought and look at him. "I know you dislike the use of the guns."

"Of course I do, I know you dislike it as well Doctor."

"Yeah, but you made guns." He looked at her.

"Yes I did and I regret many choices I made creating those guns for the Time War is one of them, but I can't change that now." she sighed picking up the device the Doctor had placed down on the table.

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"Ionising nano-membrane carbon dioxide converter." The Doctor explained to Mace and Martha who were standing near the wall watching the two Time Lords.

"And that means that ATMOS actually works." Rita shrugged. "I wasn't expecting it but it does, filters the CO2 at a molecular level."

"We know all that, but what's its origin?" Mace frowned stepping closer to the Doctor. "Is it alien?"

"No." Rita shook her head. "I said I wasn't expecting it to work because this is decades ahead of its time, shouldn't even be possible right now."

"Look, do you mind?" The Doctor glared at Mace. "Could you stand back a bit?"

"Sorry," He stepped back frowning in confusion, "have I done something wrong?"

"You're carrying a gun." The Doctor said bluntly. "I don't like people with guns hanging around me and especially not my girlfriend, all right?" He snapped.

Mace looked at Rita who gave a little nod having to agree with the Doctor, she disliked guns as much as he did, not so much the way he handled the situation but she had to agree with him. "If you insist." He then walked out.

"Tetchy," Martha muttered watching them both slightly glaring.

"Well, it's true." He looked at her glaring himself.

"He's a good man." She protested raising her voice.

"People with guns are usually the enemy in my books." The Doctor said not looking at Martha as he flashed his sonic over the ATMOS device. "You seem quite at home."

"If anyone got me used to fighting, it's you two."

"Oh right, so it's our fault?" The Doctor hissed at her.

"That's enough!" Rita stepped forward. "I will not have you both arguing." She sighed turning to Martha. "I'm sorry but I have to agree with the Doctor, guns never have a good ending." She looked at her friend with sympathy as she shot a glare at the Doctor finishing his conversation from earlier.

"Well, you both did get me the job." Rita narrowed her eyes slightly the Doctor pulling her back not noticing that she had stepped closer to Martha herself. "Besides, look at me." She said to them both, they looked up at her. "Am I carrying a gun?"

"Suppose not." The Doctor muttered.

"It's all right for you two." Her voice became softer. "You can just come and go, but some of us have got to stay behind. So I've got to work from the inside, and by staying inside, maybe I stand a chance of making them better."

"Yeah?" The Doctor smiled softly at her. "That's more like Martha Jones."

"I learned from the best."

"Well." She Doctor shrugged as Rita shook her head.

"Oi, you lot." Donna walked in holding a file. "All your storm troopers and your sonics. You're rubbish." Rita looked at her slightly offended. "Should've come with me." She said as Mace walked in hearing the conversation from outside.

"Why?" The Doctor frowned, "where have you been?"

"Personnel. That's where the weird stuff's happening, in the paperwork. Because I spent years working as a temp, I can find my way round an office blindfold," She looked at them smugly, "and the first thing I noticed is an empty file." She held it up.

"Why, what's inside it?" The Doctor asked then corrected himself. "Or what's not inside it?"

"Sick days." She showed the file name on the side then opened the file showing it to be empty. "There aren't any. Hundreds of people working here and no one's sick. Not one hangover, man flu, sneaky little shopping trip, nothing." She told them. "Not ever. They don't get ill."

"That can't be right." Mace walked over taking the file himself.

"You've been checking out the building." She grinned at them. "Should've been checking out the workforce."

"I can see why they like you." Martha smiled at Donna.

"Mmm hmm." She hummed at them.

"You are good."

"Super temp."

"Doctor Jones, set up a medical post. Start examining the workers. I'll get them sent through." Mace ordered.

"Come on, Donna." Martha looked at the red head. "Give me a hand."

"Doctor?" Rita stopped him as he went to head out with Mace. "I'm going to help Martha for a bit I'll be back though so don't try anything." She pointed at him warningly.

"Wouldn't dare go against your word." He smirked kissing her quickly before heading off.

"Right then." Rita turned to the two woman. "Direction of personnel offices? Because you may think my sonic is useless Donna, but it can be very handy at times." She raised a brow following the two out.

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"So." Martha started looking through a couple of files. "You and him are still together."

"Yep." Rita smiled flashing her sonic at one of the computers.

"He hasn't asked you yet?" Martha raised a brow at the blonde.

"Asked me?" She stopped what she was doing and looked at Martha confused. "Asked me what?"

"I think Martha means that he hasn't asked you to marry him," Donna spoke up.

"What?" Rita chuckled lightly shaking her head. "Why would he?" She questioned. "Martha it's only been around two years and a half and one of those years we didn't even see each other and that year never existed."

"But don't you want him to?" She asked.

"I." She thought for a moment looking at the computer. "I don't know." She shrugged. "Maybe if he asked, but he isn't going to ask." She sighed. "Things could get complicated."

"How?" She questioned interested.

Rita sighed moving away from the computer and facing the two woman. "On Gallifrey, most marriages ended after one of the Time Lords regenerated or of course died." She explained. "Many including my own parents either remarried after a new marriage was arranged for them or just didn't remarry, but there was ring, an extremely old ring quite like an engagement ring in human terms, they say that if two Time Lords wished to stay together then would need a set of amalgamate rings, but since Gallifrey is gone that won't happen."

"So you both with never marry?" Donna asked a little saddened.

"Unless the Doctor somehow has two amalgamate rings hidden in the TARDIS then most likely no. We're fine anyway." She shrugged it off. "We're happy." She turned back to the computer and groaned. "Bloody UNIT." She flashed her sonic at the screen then mumbled over her shoulder. "Sorry. UNIT locked everything, not even my sonic can get through thanks to them having alien technology, I'm going to find the Doctor, see if he hasn't got himself into trouble just get." She chuckled leaving the two woman alone.

"What made you say that?" Donna questioned.

"He mentioned something today." Martha lightly shook her head.

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"You are not coming with me." The Doctor protested walking out to where there were multiple troopers standing around with guns in the ATMOS factory. "I want to talk to this Luke Rattigan, not point a gun at him."

"It's ten miles outside London." Mace protested against his wishes. "How are you going to get there?"

"You have jeeps let us borrow one." Rita raised a brow spotting them, walking up and crossing her arms standing beside the Doctor.

"Ah!" The Doctor beamed taking her hand and pulling her alone. "Did you find anything?"

"UNIT locked all the computers, my sonic couldn't get through." The Doctor scrunched his nose up slightly at the thought knowing that Rita was the slightly better than himself with computers and not even she could get through when UNIT locked them. "

"According to the records, you both travel by TARDIS." Mace continued the conversation from earlier ignoring the look the Doctor had gave about UNIT locking the computers.

"Yeah, but if there is a danger of hostile aliens, I think it's best to keep a super-duper time machine away from the front lines." The Doctor informed.

"I see." He nodded. "Then you do have weapons, but you choose to keep them hidden." Rita groaned at his comment opening her mouth to deny his comment, however, Mace spoke up looking at one of the troopers who looked slightly too young to be working for UNIT "Jenkins?"

"Sir."

"You will accompany the Doctor and the Stone and take orders from them."

"Yeah, we don't do orders." The Doctor said glancing at the blonde who nodded in agreement.

"Any sign of trouble, get Jenkins to declare a Code Red." He said then saluted to them. "And good luck, sir, ma'am."

"I said no salutes."

"He also said enough with the 'sir'." Rita raised a brow.

"Now you're both giving orders." He walked off.

"Oh, you're getting a bit cheeky, you are." the Doctor muttered watching him leave as Donna headed over to them both. "Doctor."

"Oh, just in time." The Doctor took her hand with the one, not in the blondes. "Come on, come on, we're going to the country. Fresh air and geniuses, what more could you ask?"

Donna stopped looking at them both sadly. "I'm not coming with you." She looked between them. "I've been thinking. I'm sorry. I'm going home."

The Doctors face fell as Rita soon caught on realising the red head only was going home to visit. Biting her lips and desperately holding back a laugh she watched the two of them mainly watching the priceless look on the Doctors face.

"Really?" He looked at her shocked.

"I've got to."

"Oh, if that's what you want." He forced a smile. "I mean, it's a bit soon. We had so many places we wanted to take you." He glanced at Rita not seeing the amused look on her face. "The Fifteenth Broken Moon of the Medusa Cascade, the Lightning Skies of Cotter Palluni's World, Diamond Coral Reefs of Kataa Flo Ko." He named a few of the places he wanted to take Donna, the only place Rita wanted her to see was a Libary the size of a planet, seeing as her tenth self-loved reading even more than her ninth she thought it was a brilliant idea, a surprise she had yet to tell the Doctor as well knowing that he enjoyed a bit of reading here and there, nothing compared to the Time Lady's enjoyment of the past time. "Thank you." The Doctor nodded at her sadly. "Thank you, Donna Noble, it's been brilliant. You've, you've saved our lives in so many ways. You're..." he noticed the look on her face, his eyes shifted over to Rita who raised her brows at him. His gaze moved back to the red head as she continued to look at him with an amused smile, "you're just popping home for a visit, that's what you mean."

"You dumbo." Donna laughed as he groaned.

"And then you're coming back."

"Know what you are? A great big outer space dunce."

"Yeah." He nodded.

"Ready when you are, sir, ma'am." Jenkins informed them.

"What's more, you two can give me a lift." She jumped in the jeep Rita following her in now laughing her head off. "Come on." Donna told the Doctor then looked at him. "Broken moon of what?"

"I know, I know." He groaned. "You knew about it didn't you Stone?"

"No I didn't." She laughed in protest holding his shoulder to stop her from ending up on the floor rolling around as she laughed stopping every few seconds to breath. "I realised she was staying for a quick visit unlike you, the look on your face amused me so I let you continue."

"You're so kind." He shook his head.l sarcasm filling his voice.

"You love me really." She patted his arm then leaned her head on his shoulder as Jenkins drove them to Donna's street.