Donatello, Leonardo and others in “Unfinished Business”

Well, so much for those bugs. And Krang's giant knucklehead.

And we couldn't have done it without you, Casey.

Yeah, you are truly.... [he turns around to see that Casey has left] ...gone.

How do you like that? He didn't even say goodbye.

He was a strange guy. Reckless, dangerous, and totally violent.

Yeah. I liked him too.

Somehow, I got the feeling he'll cross our paths again.

[he has overheard the conversation from afar] Somehow, I got a feeling he's right.