Avengers Assemble 2012 Calendar. The Avengers team of superheroes from the Marvel Comics features in this official 2012 square format wall calendar. The Avengers team made its debut back in 1963 and its rotating roster of superhero’s has become a hallmark of the team, with one consistent theme: the Avengers fight "the foes no single superhero can withstand" along with their famous battle cry of "Avengers Assemble!". Join in with all the action featuring superhero’s, mutants, robots, gods, aliens, supernatural beings, and villains in this official Avengers Assemble 2012 Calendar.