Watch ‘The Avengers’ mock Donald Trump in comedy political ad

'Save The Day' campaign also features Julianne Moore, James Franco and Martin Sheen

The Avengers stars Robert Downey Jr, Scarlett Johansson, Mark Ruffalo and Don Cheadle have teamed up with director Joss Whedon for a comedy pro-Hillary Clinton political ad.

Other celebrities in the ‘Save The Day’ video, which mocks political ads in general, include Julianne Moore, James Franco, Keegan-Michael Key, Clark Gregg, Stanley Tucci, Martin Sheen, Neil Patrick Harris, Taran Killam and Rosie Perez.

In the clip which you can watch below, the stars joke that if voters choose Clinton as their President, they promise that Ruffalo will do a nude scene in his next movie.

Whedon has donated $1 million (£770,000) to help Clinton defeat Donald Trump in the US Presidential election, according to The Hollywood Reporter.

“It’s not about attacking because Donny [Trump’s] real good at attacking himself,” the director said. “It’s about getting people to vote, because it’s frightening the apathy that people are treating the most crucial election of their lifetimes with.”

Meanwhile, U2 frontman has also attacked Trump for “hijacking the Republican Party” and being “potentially the worst idea that ever happened to America”.

He added: “Look, America is like the best idea the world ever came up with. But Donald Trump is potentially the worst idea that ever happened to America, potentially.

“It could destroy it… America is an idea, and that idea is bound up in justice and equality for all – equality and justice for all, you know?… I don’t think he’s a Republican. I think he’s hijacked the party, and I think he’s trying to hijack the idea of America. And I think it’s bigger than all of us. I think it’s – this is really dangerous. People of conscience should not let this man turn your country into a casino.”