Hard to believe it's been almost 11 years since "Monsters, Inc." first landed in theaters -- and now, Mike Wazowski and Sully are back in action ... and back in college!

The first teaser trailer for prequel "Monsters University" debuted online this morning, showing how the best friends first met.

Here's the official synopsis from Disney:

Mike Wazowski and James P. Sullivan are an inseparable pair, but that wasn’t always the case. From the moment these two mismatched monsters met they couldn't stand each other. “Monsters University” unlocks the door to how Mike and Sulley overcame their differences and became the best of friends.

While the movie boasts "new faces and a few returning favorites" there's one face we don't really expect on seeing: Adorable little Boo, since they didn't meet her until much later in life.

That being said, the teaser alone looks great ... and we can't wait to see more of these two monsters pulling pranks in the dorms!

"Monsters University" hits theaters June 21, 2013.

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