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"Is it a bird? Is it a plane? No, its a Rock Alien!"
A guitar-shaped spaceship and Robot 1359 (voiced by Peter Cullen), search the universe for the source of rock and roll music. He finds it on Earth. 1359 wakes the crew to visit the planet. A rocket telephone booth lands in the town of Speelburgh and Absid (Tom Nolan) with his group of aliens exit. The humanoid aliens force robot 1359 to take the form of a fire hydrant. Only the Sheriff (Ruth Gordon) witnesses their landing, and she becomes obsessed with alien invaders.Dee Dee (Pia Zadora), a young singer who is in love with Frankie (Craig Sheffer), the leader of Speelburgh's local high school rock band, The Pack (Jimmy and the Mustangs). She sings her heart to best friend Diane (Alison La Placa). Dee Dee's dream is to sing with the band; Frankie loves her but doesn't agree. Meanwhile, a giant creature with tentacles lives in a nearby lake and extends can its arms throughout the town.As the aliens search the area, they encounter Dee Dee, Frankie and The Pack at the local maltshop. Absid literally loses his head over Dee Dee and decides to win her heart. Meanwhile, his cohorts search for specimens such as flowers, leaves and cow chips. Stovitz (Patrick Byrnes) stumbles across the path of two crazed mass murderers, Chainsaw (Michael Berryman) and The Breather (Wallace Merck), who recently escaped from the local insane asylum.Feeling dejected by Frankie's refusal to let her sing, Dee Dee succumbs to the charms of Absid, who asks her to join his band at the Heidi High Cotillion Dance. Frankie and The Pack arrive at the school to keep the aliens out... but they can't stop them because of the aliens' powers, they teleport into the bathroom through the toilets. Dee Dee finally gets her chance to sing, but a battle of the bands begins between the aliens and The Pack.Absid and Dee Dee sneak off to the lake. While the tentacled creature searches the banks, Absid tries to convince Dee Dee to fly back to his planet. Hesitating, she agrees to visit the ship, but discovers once there that she'll have to give up all human emotion to live on the alien's planet.Meanwhile, Diane encounters Chainsaw at the high school. The crazed killer intends to make her his next victim, but his rusty chainsaw breaks down. Love blooms as Diane helps Chainsaw fix his chainsaw.Bolting back to true love Frankie, Dee Dee finds him cornered in a school hallway by the Breather. Frankie manages to fend of his rival, only to be attacked by the monster from the lake, which has gotten loose surrounds the school with its tentacles. With his machinery now repaired, Chainsaw rescues everyone.In the end the aliens board their ship and Absid decides to leave the humans "a little alien persuasion." He fiddles with the buttons in the booth and clears away all o fthe town's pollution. He also turns the brutal Pack into a group of boy scouts. The creature leaves town, the skies clear, flowers bloom and Frankie and Dee Dee sing and dance into a smogless sunset.