Before they were besties, Mike and Sulley, your favorite monsters, were school-boy rivals.

Cue: The first time we met, we hated each other…

Yes, the two friends are back for “Monsters University” — the prequel to the 2001 Pixar hit, “Monsters Inc.” — which sees the pair trying to out-scare each other on campus. Or, as the first full trailer for the film proclaims, “Before they were incorporated, they had to be educated.” Of course, we all know how this love tale turns out, but who doesn’t like an origin story?

Take a look at the full trailer for the prequel above. “Monsters University,” starring John Goodman and Billy Crystal, hits theaters June 21.

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