Joss Whedon has been a rather active campaigner from behind the camera during this presidential race, and he's managed to fit one final Save the Day video in there as America votes.

He's assembled a variety of actors for his final PSA, including some of his Avengers, who have all united to indicate the importance of a vote.

Robert Downey, Jr., Scarlett Johansson and James Franco all appear, as do Julianne Moore, Neil Patrick Harris and comedian Keegan Michael-Key.

Former president Martin Sheen (well, in The West Wing) also participates: "Elections aren't decided by a majority - they're decided by the majority of those who show up and vote."

Whedon has invested an approximated 15 million dollars of his own money into his Save the Day initiative which has seen him unite some of Hollywood's biggest names to publicly oppose Donald Trump.

Joss Whedon’s new US election video takes aim at Congress