The world's biggest celebrities explain why it's Important that you vote in November.

Register and find your polling place at Save The Day: http://www.savetheday.vote

Starring Robert Downey Jr., Scarlett Johansson, Keegan-Michael Key, Matt McGorry, Mark Ruffalo, James Franco, Cobie Smulders, Julianne Moore, Yvette Nicole Brown, David Harbour, Veronica Osorio, Clea Duvall, Bradley Whitford, Tavi Gevinson, Ashley Johnson, Stanley Tucci, Leslie Odom Jr., Nathan Fillion, Rosie Perez, Tom Lenk, Taran Killam, Cathy Porras, Joel Landson, Randall Park, Clark Gregg, Don Cheadle, Neil Patrick Harris, Jesse Williams, and Martin Sheen

Written and Directed by Joss Whedon