When Earth astronaut Capt. Chuck Baker arrives on Planet 51 -- a world reminiscent of American suburbia circa 1950 -- he tries to avoid capture, recover his spaceship and make it home safely, all with the help of an empathetic little green being.
June, an optimistic, imaginative girl, discovers an incredible amusement park called Wonderland hidden in the woods. The park is full of fantastical rides and talking, funny animals - only the park is in disarray. June soon discovers the park came from her imagination and she's the only one who can fix it, so she bands together with the animals to save this magical place and bring back the wonder in Wonderland.