The trio of stars talk about about reaching the heart of darkness — and ridiculousness! — on the set of their jungle-set action comedy. Jackson, Eric Winzenried. When production on a fictional film about the Vietnam War stalls due to the antics of its spoiled. Starring Ben Stiller, Robert Downey Jr. McBride, and Nick Nolte. lead an ensemble cast in 'Tropic Thunder', an action comedy about a group of self-absorbed actors who set out to. , and Jack Black. the strengths brought to the project by Ben Stiller, Jack Black, Robert Downey, Jr. Robert Downey Jr. Tropic Thunder () - Robert Downey Jr. , Jeff Kahn, Anthony Ruivivar, Jay Baruchel, Brandon T. , Brandon T. Ben Stiller, Jack Black and Robert Downey Jr. lead an ensemble cast in "Tropic Thunder," an action comedy about a group of self-absorbed actors who set out. [HOST]: Tropic Thunder: Ben Stiller, Jack Black, Robert Downey Jr. Jackson, Jay Baruchel, Danny R. - Jack Black - Ben Stiller - Comedy - Action - LRC Watch Party: Con La Reina Creole, Retro Nerd Girl, Rrr Mmm. . Jack Black having his belly drawn on by Robert Downey Jr! Ben Stiller, Jack Black and Robert Downey Jr.