Tom Cruise is without a doubt one of the biggest movie stars on the planet.| Starring in action packed roles like Mission Impossible, it's hard to see Tom Cruise slide into other genres. Though his turn in Tropic Thunder as Les Grossman, might be one of his best roles to date. Tropic Thunder not only showed us the comedic side of Tom Cruise, it cemented his character Les Grossman as one of the best supporting characters in a comedy. But why exactly did Tom Cruise decide to put on the fat suit and bald cap for Tropic Thunder?