Actor Mark Ruffalo attends the Academy Awards nominee luncheon on Feb. 8 in Beverly Hills, Calif. (Kevin Winter/Getty Images)

It’s got all the elements of your typical get-to-the-polls PSA: an excessive number of celebrity cameos with everyone repeating the same words, handwritten signs and a gray-scale background with dramatic piano playing in the background. We’ve seen this all before, right?

Then James Franco shows up with a mullet and mustache reminiscent of a 1970s biker, and things actually get interesting.

“Avengers” director Joss Whedon’s new public service announcement uses humor and lots (and lots) of famous people — including Robert Downey Jr. and Scarlett Johansson — to promote his just-launched get-out-the vote effort, Save the Day. The video spoofs similar efforts made in the past by nonpartisan groups such as Rock the Vote.

Whedon’s, however, is nakedly partisan.

“You only get this many famous people together if the issue’s one that truly matters to all of us,” Taran Killam and Randall Park say. “A disease,” Johansson suggests. “Or ecological crisis,” Clark Gregg adds.

Don Cheadle calls out the Republican presidential nominee without naming him: “Or a racist, abusive coward who could permanently damage the fabric of our society.” If you’re still stumped on who it’s targeting, the next line should clear it up: “Do we really want to give nuclear weapons to a man whose signature move is firing?”

The PSA ends by promising that if you vote, Mark Ruffalo will do a nude scene in his next movie. “Make Mark be naked, by making your mark,” Stanley Tucci and Cobie Smulders command.