Tom Cruise as Les Grossman on MTV AwardsTom Cruise has a movie to promote (this summer's 'Knight and Day') and MTV has a movie awards show to put on, so welcome back Les Grossman, Cruise's comic creation from 2008's 'Tropic Thunder.' Cruise's cameo in the Ben Stiller-directed comedy nearly stole the entire film from Oscar-nominated Robert Downey Jr. -- no small feat.