Planet 51

Planet 51 is the story of a strange visitor from another planet who has to find a way to make the native inhabitants understand that he means them no harm and, as the cliché goes, that he comes in peace. What gives the film its comic flair is a simple inversion of the expected: the strange invader is actually an American astronaut and the natives are little green creatures that look and act like extras from an Ozzie and Harriet show from the 1950s (if Ozzie and Harriet had green skin and antennas sticking out of their foreheads).