On top of a building the turtles were watching TCRI

Donnie: According to the Kraang storage device that I decrypted some kind of scouting ship is coming through the Kraang portal tonight

Leo: So we all have to stay alert

Karai: Yeah you never know what could sneak up on you

The turtles turned around and saw Lizzie and Karai

Lizzie: surprise

Leo: Cute Lizzie but I'm not in the mood

Lizzie: to bad because I am

Karai and Lizzie started attacking Leo

Leo: we don't have time for this. Guys!

his brothers joined the fight

Mikey: Booyakasha!

Karai: Booyakasha? What does that even mean?

Mikey: I don't know but it's fun to yell!

He threw his chain at Lizzie but she grabbed it and kicked mikey in the stomach

Lizzie: you sure know how to make girls feel welcome

Karai: We heard the scrawny one mention the Kraang. What's going on?

Mikey: wouldn't you like to know!

Lizzie: yes that's why we asked

Leo: it's none of your business!

Karai and Lizzie dodged more of the turtles attacks

Karai: come on let us in on the fun

Lizzie: it might be better then fighting against you

Raph: we're a little busy trying to stop the beginning of an alien invasion here so do us a favor and get lost!

Karai: An alien invasion? Are you serious?

Suddenly a kraang spaceship flew out of the TCRI building

Leo: This can't be good

Mikey: guys I think I need to change my shell

Lizzie: Ew

Karai: I hope you have a plan for fighting that thing

Leo: of course I do

Lizzie: what kind of plan?

Leo: step one-

The kraang ship started shootings lasers at them

Leo: Run!

Everyone jumps down from the building and starts running

Karai: What the heck was that?

Leo: I don't know but off the top of my head I'd say they use it for flying and shooting at things

Lizzie: oh really? I never would've guessed!

Karai and Lizzie hide in an alleyway while the turtles to back underground

___________________________________

Back at shredders lair Karai and Lizzie told the shredder everything

Karai: It's true. The Kraang are plotting an invasion. we saw the ship. We've gotta do something before it's too late!

Shredder: We shall proceed as planned

Lizzie: but father-

Shredder: Tomorrow night we will receive a shipment of new weapons These shall help us put an end to the turtles and Splinter

Karai: We can deal with that later. Didn't you listen to a thing we-

Shredder: Karai. Elizabeth. You have said your piece. Now you will do as I say

Karai and Lizzie: Yes Father

They both left shredders lair

___________________________________

Later that night Karai and Lizzie ambushed Leo on top of a building

Leo: This is getting old

Karai: we want to help you fight the Kraang

Leo: really?

Lizzie: it's not every day ninjas get to fight aliens

Leo: No of course not. We're enemies. You want to destroy us. Your both loyal to Shredder. Should I keep going?

Karai: if the kraang win we don't have a planet anymore that makes our little fight seem pretty pointless doesn't it?

Leo: I doubt Shredder would agree

Karai: Shredder is stubborn and short sighted. He drives us crazy. His stupid vendetta is gonna take us all down. He may not be able to see that but we know you do. What do you say? Work together for now?

Lizzie: then we can go back to being enemies

Leo: Sorry Lizzie

He jumped down from the building and went back to the lair

___________________________________

Later that night Lizzie and Karai saw the kraang spaceship again. They jumped on the ship and started attacking it. Leo used his motorcycle Donnie built to go after them

Lizzie and Karai fall of the kraang ship but landed on Leos motorcycle

Leo: you ok?

Lizzie: yeah. Thank you

Leo: don't mention it

Karai: i'm really not good at saying thank you

Leo: and?

Karai: that was it

___________________________________

Thet headed back underground and went inside the Shellraiser

Leo: we're back

Raph: You brought them inside? They'll see all our gear!

Leo: Karai and Lizzie just risked there lives to save us. They've earned a little trust. Let's them her out

Raph: your the boss

Karai: You guys need our help. You really think you can shoot down an alien warship with garbage?

Lizzie: it won't work

Donnie: it's compressed garbage!

Mikey: And manhole covers

Karai: our point is to take out a spaceship like that you need a real weapon. What if we both got you a shoulder fired missile launcher?

Lizzie: how's that for a real weapon?

Raph: I'm starting to like them

Donnie: Where are you two gonna get a shoulder fired missile launcher?

Karai: shredder of course

Mikey: we're all talking about the same shredder right? Lots of blades? Really hates us?

Raph: something tells me he's not gong to want to share his weapons with us

Lizzie: who said anything about sharing?

Karai: He won't know about it he's buying a big shipment of weapons down at the docks tomorrow night. All we need to do is sneak in and help ourselves

Raph: Anyone else smell a trap?

Mikey: Sorry. That was me

Lizzie: Ew

Karai: Why would we trap you? Your the only ones who know what the Kraang are up to and Lizzie clearly likes-

Lizzie: the point is it sounds like a fair deal

Donnie: True but you guys don't really have the best track record

Karai: Fine we'll get you the missile launcher ourselves

Leo: Your really willing to steal from Shredder?

Karai: Look these things have to be stopped If Shredder's not going to do anything about it we will with your help or without it

Leo: Alright here's the deal. You get us the missile launcher and we'll team up

Lizzie and Karai: deal

___________________________________

Later that day the foot clan arrived at the docks to get the weapons but Karai and Lizzie saw shredder about to be hit by a grenade

Karai: look out!

Karai pushes him out of the way making the grenade go into the ocean. Lizzie fired the missile launcher at the turtles but they were able to dodge it

Raph: Well this can't get much worse.

Then the kraang spaceship flew towards them. The turtles ran off but mikey Donnie and Raph ran into the shredder and Karai and they started fighting

Donnie: We'll catch up with you later!

Leo went to grab the missile launcher but Lizzie ran in front of him holding her scythe

Lizzie: I thought you were my friend and you betrayed me! I can't believe I was actually starting to like you!

Leo: you were-

She kicked him in the stomach

Lizzie: your just like your master!

Leo: splinter?

Lizzie: the shredder raised me as his daughter. Karai may be his real daughter but she's my sister. I never got to know my birth parents because your master to them away from me.

Leo: that's a lie!

Leo and Lizzie were almost hit by the kraang laser

Leo: we have to stop that thing!

Lizzie: you want a fight so bad? You got one!

Lizzie started fighting Leo and he fought back

Leo: Lizzie listen to me! Splinter would never hurt your parents!

Leo threw a smoke bomb and when it cleared Lizzie saw him fired the missile launcher at the Kraang ship making it sink into the ocean.

___________________________________

The turtles were able to escape and get back to the lair

Donnie: Leo it's not that bad. You blew up the Kraang ship!

Leo: But I also blew our chance to get Karai and Lizzie on our side.

Raph: Look Karai is the Shredder's daughter his blood and he raised Lizzie. They were never going to be on our side.

Leo: Yeah maybe you're right. Maybe I was just believing what I wanted to.