While he's known as an advocate for Science Bros, Mark Ruffalo is also a passionate activist for water defense and social justice -- say what you will, but for one fan, donating to a good cause could reap great benefits! This morning, Ruffalo announced his new prizeo campaign in support of the water defense fund, where one lucky fan will win the chance to hang out with him (and presumably some of the cast) on the set of [The Avengers: Age Of Ultron](movie:293035). The higher you donate, the higher chances you have of winning. Alongside hanging out with The Hulk, fans who donate at certain scales can walk away from the campaign with t-shirts, e-cards, personalized videos, and signed photos from the actor himself.
The campaign ends next week, and fans can support by using the hashtag "AvengersSetwithMark" to spread the word. Hulk out for Water Defense! To donate, click here!