Teenage Mutant Ninja Turtles, Season 1

Donatello:
(Narrating) My name is Donatello, and as a turtle of science, I like to investigate things. But I never thought my study of the strange crystals we found in our lair would awaken creatures from the underground, lead us on a search deep below the Earth, or take us to an abandoned Foot Genetic Lab where terrible things were done in the name of the Shredder.

Foot Scientist/Michelangelo:
There are some things man was never meant to tamper with.

Mikey:
That's the one line in a monster movie you don't wanna hear.

Don:
(Narrating) As a turtle of science, you wouldn't think I'm the type to believe in monsters, but you'd be wrong, dead wrong.