Alan is an acorn who lives in a forest with his friends. One day, a spacecraft appears overhead and beams him up to a metallic room. In this room, he meets Tina the tennis ball, Marty the mushroom, Casey the coin, Barry the battery, and Craig the carrot. The six of them are gathered there for a special purpose. They are challenged to pass through a door, and whoever makes it through will be sent back in time to prevent their planet from blowing up.