Wow, this took me a while to finally make. Woof. Anyways, enjoy!
[Trans. Int. Metro Tower; Day]
(Casey Jr, Leonardo and Leo enter Metro Tower, most of the building is covered by Krang growth.)
Leo: Oh, man, is this what the future looks like?
Casey: Nope, the future is worse. Much worse.
Leo: muttering Worse?
Leonardo: Donnie, Mikey, do you read me?
Donatello: Come in, Leo. Come in, Leo. We've extracted ourselves from the subway and are currently ascending a staircase.
(Donatello, April, April O'Neil, Mikey, Michelangelo, Master Splinter and Splinter reunite with Casey Leonardo, and Leo while Donnie lingers near the Metro Tower staircase.)
Donnie: I'm getting a lot of interference, but if you hold still, I can triangulate your position using a complex geolocation algorithm.
Donatello: Uh, Donnie?
Donnie: Odd numbers, primes... No, almost... Almost!
Splinter: Ahem.
Donnie: Ugh. I never get to use my algorithm.
Leonardo: Man, I am so glad you guys aren't dead.
Mikey: Ditto.
Michelangelo: I missed you, man!
Leo: Okay, before this gets too mushy, we need to locate the Raphs. Donnie, can you tell me if he's still in the building?
Donnie: Bet your mama's subatomic particles I can. Got him! He's close. He's almost on top of us. Wait, he is on top of us.
(Slime drips onto Donnie's tech gauntlet from above. A cocoon is revealed to hang from the ceiling.)
All: Raph!
Splinter/Master Splinter: Raphael!
Leonardo: Quick, get him down. Get him out of here.
(Casey's chainsaw ice hockey stick severs the cocoon's supports and it splats onto the floor. April and Splinter try to claw Raph out, but are unable to penetrate its membrane. Leo slices the cocoon open with his katana and Raph slides out.)
Leo: Hang on, big brother. We got you. Almost there.
Leonardo: Raph?
(Upon waking, Raphael punches Leonardo and throws Donnie and Mikey to the floor as they try to restrain him. Leo looks up, clutches his head and saw what was happening. An eye buldged as Krang growth burst from Raph's eye. The pink growth forms on his body and tentacles take the form of his hands. The Krang growth covers his torso and his shell as three claws burst from his left hand. Everyone watched in horror to see what happened to their brother. Raph's eye had turned yellow while the other his red pink. The infection covered his torso and his shell as three claws burst from his left hand while the right turned into a tentacle. Pink goo surrounded Raphael's body, his left hand becoming a tentacle. April, Casey and Splinter get flunged by the Infected Raph as the Key falls from April's backpack as they fell to teh floor. The infected Raph retrieves the Key and Krang One emerges from the cocoon.)
Krang One: Surprise.
Mikey: [tearfully and in rage] What did you do to my brother?
Krang One: Improved him.
(Leo glared and growled in fury until the floor bursts open as the subway bus Krang zombie emerges alongside Krang Two and the other Krang zombies. They surrounded the group as the Raph gives Krang One the Key.)
Krang One: Thank you for this. We will be putting it to good use. Come, the world awaits destruction.
(Krang Two leaps from the subway Krang zombie to follow Krang One and Raph.)
Krang Two: Tear them apart!
(The Krang zombies charge at them. April O'Neil takes a baseball bat to her backpack and shatters the herbicide vials, coating the Krang zombies in it.)
April O'Neil: We gotta move.
(Donnie carries Mikey and April and Casey run away, Leo grabbing Leonardo's hand, still horrified to see what happened to Raphael.]
Leo: Lee, move!
Leonardo: NO!
(Leo took one last horrfied look at his infected brother before the elevator doors closed. Splinter throws a smoke bomb and vanishes with April, Casey, Leo, and Mikey.
I was debating on whether 12 Raph should be infected. Anyways, you know the drill. (Actually, you don't. The drill is still in beta)