Olivia, or Allie as they knew her, woke on an office chair in the Arrow cave. She looked around amazed at the structure of the bunker before noticing the people surrounding her.

"H-hi!" She greeted them nervously. "I'm Allie."

"And..." a petite woman asked.

"Oh, she is your new canary!" Cisco informed them.

"Just like that? How convenient. Isn't it a bit too convenient?" the boy asked.

"Oh, it's not just a vocal," Allie explained as she finally got off the chair. "I have sonic powers!" she said, wiggling her fingers to show them what she meant while Cisco sighed.

"Well, regardless. You're here anyway. This is Curtis Holt, our tech guy," Diggle introduced.

Holt waved at her and Allie cooly nodded at him.

"Thea Queen,"

Before Diggle could finish, Allie squealed and excitedly hugged her. Thea stood rock solid, looking at Diggle to rescue her.

"Sorry! I've heard about you. Through the grapevine, or the news, or something. It's really cool to meet you."

Thea rolled her eyes and walked away.

"So? Are we gonna test her?" Holt asked as he returned to his computers.

"Why?" Cisco followed him. "You have a meta chamber? You have your thing, we have ours, okay. Don't be tryna take over my gig..."

Allie left them to argue as she explored the cave. Or, quiver, more appropriately. She'd been in caves, and this was nothing close to it. She came across a wall of displays. Following the row of minor gadgets, Allie came face to face with The Bow. Her nose itched as her fingers traced the arch, dying to hold her father's weapon. Noticing that everyone else was busy, she quietly grabbed it and walked over to the training area.

The cement wall had seen some damage. Allie smiled as she turned on the ball launcher; she was about to leave her mark. First she got used to holding the bow in her hand, holding it where her father held it. As she pulled back the string along her cheek, an energy arrow formed in the bow. The balls launched and she released the arrow.

Ffwhipp!

It split enough times to cover each tennis ball, pinning them to the cement wall. She got one more round in before someone grabbed the bow. Olivia took her time to pay attention.

It was his hand.

The hand she should have held as she learned to walk. The hand who should have let her go when she learned to ride her bike. Tonight, it was the hand that wanted to throw her out.

"Next time, ask," Arrow ripped the weapon from her hand and walked to the people he knew. His anger at strangers touching his stuff didn't give him the pleasure to comment on her marksmanship.

The balls fell as Olivia followed her dad back to the central platform. They were all heading out; he'd apparently told the rest where they were going. Cisco caught Allie up and wished her well as he sent her up after the others.

Ghosts. How ironic.

Her first mission with her dad was a train heist. Cisco had given her a simple suit, just enough to hide her identity. Speedy was with Captain Lance, clearing out the train station while Diggle and her helped Arrow get to the train.

"Get closer!" Arrow yelled at Diggle who was trying his best to keep up with a speeding train.

"Jump!" Allie suggested, getting some 'are you serious?' looks, but she sighed and said it again with determination.

Arrow jumped and Allison sent a sonic beam behind him, helping him get on top of the train. Allie followed after him. They didn't have time to stop and comment before they swung into a compartment, pulling out the one Ghost guarding it.

"Stop the train," Arrow assigned to Sonix, and she nodded, climbing out to the top to make her way to the front.

"Mr. Slater?" Sonix heard through her comms.

"Sorry. He had to get off at an earlier stop."

Olivia smirked. So, dad could quip... when he wanted to.

"Stop. The train."

"No, I don't want to. Even if I did, I couldn't. I destroyed the braking system 20 miles ago."

Sonix paused as she was just a box away from the control car.

"Willing to die to destroy a train station?"

"No, that would be ridiculous," their target replied ever so calmly, seemingly agitating Arrow.

"Then how are you planning on getting off the train?!"

"Oh, you don't know who I am, do you?"

Olivia sprinted back.

"I'm Damian Darhk."

Shit.

Sonix could hear the arrows flying through the comms, followed by fighting. Arrow was good, having been trained by many schools, one of them being the League of Shadows. But he was up against Darhk, an original of the League.

"Is that all you got?"

This couldn't end well. And then..

"Ahh!" She heard dad grunt in pain.

"It seems you've much in common with the Arrow."

Olivia was a half a box away, but she could feel it. Darhk was summoning the force, something that had a strong connection to her. It changed her, gave her a boost. And she summoned all her energy into getting to Arrow in time.

"You're both dead," Olivia heard Darhk say as he had Arrow pinned to the door, draining his life source.

Thinking quickly, Sonix summoned a discarded arrow and shot it through Darhk's back, making him fall away from Arrow. She ran up to help her father, syphoning some of her energy into him as she gave him a hand.

"Thank you," Arrow resignedly said before they turned to find Darhk gone and Diggle standing in his place.

"We need to stop the train," Diggle realized as they followed Arrow off it.

"Got any ideas?" Arrow asked as they rolled up off the ground.

"Blow it up," Allie suggested to another round of crazed looks.

"Can you trust me? For like, five seconds? You don't have a whole lot of other options."

Arrow looked at Diggle to confer before shooting an explosive arrow at the speeding train. The weapon landed and the vehicle blew up, emitting a gigantic, fiery explosion. Sonix stepped up and positioned her hands as if holding a large object as her powers manipulated the fire into going upwards in containment.

Sonix staggered from the immense use of her power and Arrow quickly step up to catch her from falling. Olivia looked up, her father's masked face so close to her, concern lightly etched on it. She didn't want to stand up, exit this embrace, but the blood slipping over her lip made her snap out of her thought. 

Olivia quickly stepped away, wiping away at her bloody nose.

"Yeah, I'm fine. We should- we should get out of here."

"This way," Diggle lead them to the car and drove them back to the cave.

None of them paid significant attention to the black car parked nearby, Darhk watching from inside.

"So? Can she stay, or not?" Cisco asked the team as they lounged about the platform.

Everyone looked to Oliver as he stood by himself, leaning against the railing with his arms crossed. Finally, he sighed and relaxed.

"Fine! She's in... for now! As long as she can keep her hands to herself." Oliver wagged a playful finger at her as he passed her by.

"I should get going," Cisco's voice pulled her attention. "Don't wanna be late to work tomorrow."

"I'll walk you out!" Allie jumped.

Cisco gathered his things as he waited for her by the elevator.

Olivia met up with him and they rode the elevator up in silence, but she was dying to get outside to talk.

"Thank you! So much, for getting me here." She hugged him as they were a safe distance away.

"Yeah, but I wouldn't get too excited just yet. Oliver, he's a cautious person. He's okayed you, but you still gotta work on his trust."

"I... will keep that in mind. Have a safe trip," she moved him in the direction of his car.

"You too, Bionica!" Cisco winked over his shoulder as he got in and then drove away.

Olivia watched his car drive off before finally returning back to the cave, excited about her present future.