21 actors you probably didn't realize voiced Pixar characters

Pixar films generally become instant classics due to their stunning animation, creative storytelling techniques, and memorable casts of characters. And while some Hollywood stars like Tom Hanks or Ellen Degeneres are instantly recognizable as the voices behind the animation, other actors are harder to pinpoint.

We've gone through every Pixar film released and identified all the actors you may not have realized were cast in roles both big and small. Scroll down for a look.

"Toy Story" debuted in 1995, with Tom Hanks and Tim Allen starring as Buzz and Woody. But do you remember who voiced Rex?

That would be Wallace Shawn, perhaps best known for his role of Vizzini in "The Princess Bride."

Four years later, a new "Toy Story" character was introduced: Stinky Pete the Prospector.