Several well known actors have added their voices to the Monsters, Inc. sequel Monsters University.

Helen Mirren (The Queen, HitchcockMonsters University, Dean Hardscrabble:

Alfred Molina (Spider-Man 2) will voice Professor Knight:

Dave Foley (A Bug’s Life) and Sean Hayes (Will & Grace) will voice Terri and Terry, a two-headed monster:

Joel Murray (Two and a Half Men, Mad Men) will voice older student Don Carlton:

Charlie Day (Horrible Bosses, It’s Always Sunny in Philadelphia) will voice Art:

Nathan Fillion (Castle) will voice this horned monster standing behind Sulley:

Aubrey Plaza (Parks & Rec, Safety Not Guaranteed) appropriately voices the goth-looking monster on the left:

In addition to these roles, John Krasinski (The Office) will voice a “frightening” character named Frank McCay, “a Scaring super star at Monsters, Inc.”

Lastly, Bonnie Hunt (Cheaper By the Dozen) will voice Mike Wazowski’s grade school teacher Karen Graves.

These actors and actresses join returning voice actors Billy Crystal, John Goodman, and Steve Buscemi.

We’re thrilled to see high profile names stepping into one of Pixar’s animated worlds. Monsters University opens in theaters June 21. Yesterday we learned about the frats and sororities at the fictional school.

Thanks, EW.