The trio of stars talk about about reaching the heart of darkness — and ridiculousness! — on the set of their jungle-set action comedy. Robert Downey Jr. Jackson, Eric Winzenried. Ben Stiller, Jack Black and Robert Downey Jr. , Brandon T. lead an ensemble cast in "Tropic Thunder," an action comedy about a group of self-absorbed actors who set out. the strengths brought to the project by Ben Stiller, Jack Black, Robert Downey, Jr. - Jack Black - Ben Stiller - Comedy - Action - LRC Watch Party: Con La Reina Creole, Retro Nerd Girl, Rrr Mmm. . Jackson, Jay Baruchel, Danny R. , Jeff Kahn, Anthony Ruivivar, Jay Baruchel, Brandon T. McBride, and Nick Nolte. Starring Ben Stiller, Robert Downey Jr. Tropic Thunder () - Robert Downey Jr. , and Jack Black. [HOST]: Tropic Thunder: Ben Stiller, Jack Black, Robert Downey Jr. Jack Black having his belly drawn on by Robert Downey Jr! 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 to. When production on a fictional film about the Vietnam War stalls due to the antics of its spoiled.