- Splinter: A creative mind must be balanced by a disciplined body. We must learn stillness and alertness. For they are the only defense against the unexpected.
- [Splinter makes Raph take Casey to the surface]
- Michelangelo: And that's how they defeated The Thing that Wouldn't Leave!
- Raphael: You didn't come all the way down here for the nickel tour. What's the 4-1-1 streetside?
- Casey Jones: Graffiti. It's everywhere, all over town.
- Michelangelo: And I think I speak for everyone in the room when I say, DUH!
- Donatello: We're New Yorkers, Casey. We've seen graffiti before.
- Casey Jones: Uh-uh, not this kind.
- [Casey holds up a picture of a spear skewering four turtles]
- Casey Jones: I think someone's trying to send you a message.
- Hun: We've been over this again and again, freak. I'm only gonna ask you this one more time: Who do you work for? How long have you been on this planet? What is the level of your technology?
- Raphael: Planet? Technology? Boy, you are barking up the wrong shell.
- Hun: ANSWER ME!
- Raphael: Come to think of it, who do YOU work for? I mean, you look way too dumb to be in charge of all this.
- Hun: [holds a buzzsaw to Raph's face] Your choice: you can talk, or you can let your DNA do the talking for you. Now is there something you want to tell me?
- Raphael: Just this...
- [knocks out Hun]
- Raphael: Sweet dreams, lard butt!
- Casey Jones: These the only DVDs you got?
- Michelangelo: Yeah. In fact, why don't you borrow some and watch them at home?
- Casey Jones: That's okay, I'll watch them here.
- [walks over to the DVD player]
- Casey Jones: C'mon, eject, EJECT! You useless piece of...!
- [smashes the machine; Mikey screams]
- Casey Jones: Whoa, think your player's broken.
- Donatello: Uh, no problem... I'll fix it, in the morning!
- Casey Jones: [to Donnie] Whatcha working on?
- Donatello: Uh... boring stuff! Really really boring stuff!
- [Splinter thought Casey was an intruder]
- Splinter: Please forgive my rash actions.
- Casey Jones: No problemo.
- Splinter: Although next time, you would be wise to heed the ancient Japanese proverb: Phone first!
- [first lines]
- Raphael: Ever see one of those old movies where the private eye wakes up after being knocked out cold? He always says the same thing: "Uh... where am I?" Okay, so it's not exactly original, but it's true, I have no idea where I am. Is this an operating room? Torture chamber? TV game show? Last thing I remember, I was bapping a bunch of street thugs with Casey...
- Leonardo: We'd better find Raph quick before he brings back some seriously unwanted houseguests!
- Michelangelo: [looks at Casey] Yeah, we've already got one of those.