The trio of stars talk about about reaching the heart of darkness — and ridiculousness! — on the set of their jungle-set action comedy. Ben Stiller como Tugg Speedman. Tropic Thunder () - 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. K ; FBA WITH DEY. Jackson. lead an ensemble cast in "Tropic Thunder," an action comedy about a group of self-absorbed actors who set out. ; Robert Downey Jr. como Kirk Lazarus. Ben Stiller, Jack Black and Robert Downey Jr. ; Jay Baruchel como. Tropic Thunder: Ben Stiller, Jack Black, Robert Downey Jr. , Nick Nolte, Matthew McConaughey, Steve Coogan, Jay Baruchel, Danny McBride, Brandon T. ; Jack Black como Jeff Portnoy. - Jack Black - Ben Stiller - Comedy - Action - LRC Watch Party: Con La Reina Creole, Retro Nerd Girl, Rrr Mmm. ; Steve Coogan como Damien Cockburn. Jack Black, Ben Stiller & Robert Downey Jr In Tropic Thunder #boomchallenge #film #actors #film @KORBA ; layla<3. .