Marvel has a new franchise crossover, and it isn’t the one Disney is marketing. Over the past week, more than 20 actors with Marvel Cinematic Universe credits – Benedict Cumberbatch (Doctor Strange), Mark Ruffalo (the Hulk), Don Cheadle (War Machine), Ian McKellen, whose X-Men run predates the MCU but whose fandom overlaps it – signed onto “Freedom for Marwan,” a campaign demanding the release of Marwan Barghouti from Israeli prison.