Iron Man, Hulk and Spidey rocket into space to stop a potentially devastating meteor shower from reaching Earth, but are surprised to find the meteors are actually Meteor Men, a group of intergalactic frat boys engaging in their most awesomely favorite extreme sport: Planet-Bombing. After negotiations (Could the Hulk quit hitting us, please?) the Meteor Men agree not to bombard Earth IF the heroes show them an equally good time on a variety of other planets, and other extreme sports. Will our heroes survive Albernathean Rhino Riding? How about Kree Karaoke? Or the galaxy's most dangerous extreme sport, Black Hole Bungee Jumping?