Teenage Mutant Ninja Turtles, Season 1

Raphael:
(Narrating) Meet Stone Biter, Razor Fist and Quarry. They may look like monsters, but these poor souls were once ordinary people 'til the Shredder's mad scientists performed horrible genetic experiments on 'em. Experiments that will eventually leave them mindless like these other examples of Shredder's handiwork. The only thing keeping Quarry and his pals safe is a crystal powered force field, but now the crystal's all burned out and the only place to get another one is the Forbidden Zone.

Quarry:
Something unspeakable dwells there amidst the crystals, it is a forbidden place.

Raph:
(Narrating) But we have no choice, so we all head down there anyway and that's when all shell breaks loose.

Donatello:
Hey?

Raph:
Donnie! (Narrating) Suddenly Donny's gone and I swear someone's gonna pay.