Planet 51

An American astronaut believing himself to be the first person ever to set foot on Planet 51 gets the shock of his life when he steps out of his spacecraft and discovers a race of tiny green people living in quaint communities reminiscent of 1950s America. Unfortunately, the tiny extraterrestrials suffer from a universal fear that their utopian community will one day be overrun by alien invaders... just like the extra-large astronaut who now stands before them. Here we have a Planet 51...