Raphael: Every minute we stay down here, Shredder gets stronger and Mikey gets more annoying.
Donatello: We're training... sort of. As soon as the sun goes down, it's Turtle time.
Bebop: Let's rumble, baby.
Shredder: Foot Clan, vanish.
Rocksteady: Can you smell what this Rock is cooking?
Baxter Stockman: Inside every human, there's a dormant animal gene. This will return them to their rightful place in the animal kingdom.
Baxter Stockman: This is gonna be insane.
Krang: Time for a new game! Look out, Earth, it's playtime.
Rocksteady: You ever see a rhino charge?
Leonardo: We keep failing.
Splinter: Keep the team unified, and you shall always succeed.
Shredder: We meet again, Turtles.
Bebop: Turtles are out, rhino and warthog are in.
April O'Neil: If you want to go down swinging, these guys hit harder than anyone.
Casey Jones: Everything's normal. And the next thing I know, I see a garbage truck, and it starts launching manhole covers.
Rebecca Vincent: What are you?
Michelangelo: We're not really into labels.
Leonardo: Some call us freaks... monsters.
Raphael: Let's just say we're four brothers, who hate bullies and love this city.
Leonardo: Sensei, the Foot Clan are intending to break Shredder out.
Splinter: If Shredder is free, his reign of terror over the city will begin again.
Leonardo: Exactly.
Splinter: Then there is only one question: why are you wasting time talking to a grumpy old rat? Go get him.
Bebop: Hey, do I look fat?
Rocksteady: No, of course not! You look... really FAT.
Answer: It would be nearly impossible for the Turtles to continue their crimefighting crusade if the public knew of their existence. They would become instantly recognizable international "celebrities" who were constantly in the public eye, allowing criminals to avoid and work around them.
raywest ★