Staff Writer @MargiePattonNow this will make your friends green with envy! Mark Ruffalo is giving you the chance to visit the set of The Avengers: Age of Ultron by being a real-life superhero in defense of the world's water supply. Fans who donate to the Water Defense campaign's Prizeo page can win a trip to London to hang out with the actor and long-time environmental activist on the set of the Marvel blockbuster. Other perks include T-shirts, E-cards, tweets from Mark, and more. The campaign ends on July 15 (tomorrow!), so donate now for your chance to win a smashing good time with The Hulk himself! Keep Up With PopWrapped On The Web!