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Olie Polie is a little robot boy who lives on an all-robot world far away from Earth. As Olie, his family and friends prepare for his sister Zowie's birthday party, they don't know that their plans are going to be rudely interrupted by Gloomius Maximus, the evil villain who hates fun and happiness -- and especially hates birthday parties. Gloomius learns of plans for Zowie's party and immediately launches a "gloomerator" ray at planet Polie. Fortunately, Olie and his friends ward off the ray's fun-deadening effects, and together they laugh Gloomius away -- but not before he escapes with the super-silly ray that Olie had made for Zowie. A damper is also put on the party when Pappy, Olie's grandfather, bursts his happy gear and is then captured by Gloomius, and dampened even further when Gloomius steals planet Polie, intending to relocate it forever into the dark, mirthless Galaxy of Gloom. Fortunately, Olie and company foil all of the villain's plans, and an act of kindness on Zowie's part even succeeds in reforming Gloomius from evil genius to all-around good guy.