He gave the world Buffy the Vampire Slayer and now he's promising us Mark Ruffalo naked. But, there's a catch...

As per every American election since (probably) time immemorial, celebrities have rallied together to get the public to vote. In the past they've tried social media campaigns, T-shirts, stickers and even performing at election rallies. But, this time, they have the help of writer, director and producer Joss Whedon.

His aim is simple: get people to the ballot box on November 8 and persuade them that it's a bad, bad idea to give nuclear weapons access to a man "whose signature move is firing things".

In a three-minute video, he lets his troupe of Hollywood A-listers perform a heartfelt and funny campaign that effectively mocks the general milieu of celeb-endorsed political activism while also doing just that.

Though none of the videos speakers - including Robert Downey Jr, Scarlett Johansson, Mark Ruffalo, Julianne Moore, Tavi, Keegan-Michael Key, Don Cheadle, James Franco, Jesse Williams, Cobie Smulders, Martin Sheen and Neil Patrick Harris - ever actually mention the words 'Donald' or 'Trump' or mutter Hilary's name, they make it pretty obvious who they are referring to.

An impassioned Cheadle describes the unnamed as a "racist, abusive, coward who could permanently damage the fabric of our society".

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As Julianne Moore says, this partisan video is "just a shit-tonne of famous people" trying to make everyone vote - and bring about the ultimate goal of Mark Ruffalo doing a nude scene in his next movie.

Joss Whedon made his long-awaited return to Twitter - having left it in May - to tweet a link to the Save The Day campaign.

It was slightly undermined by the fact that he got the link wrong, but you know, it's the thought that counts.

And not one to give up, he tweeted another link later:

This isn't the first time Whedon's waded into politics. In a similar move back in 2012, he created a tongue-in-cheek slur video suggesting then GOP nominee Mitt Romney would bring about the zombie apocalypse if he made it to office.