Q:Generate a question about the following movie plot: Two maintenance employees of a nuclear power plant are conducting an outdoor safety check when they become anxious to leave. Eager to get to the local bar and have a drink, they skip part of the test. Unfortunately a large buildup of pressure causes a yellow toxic gas to leak from one of the pipes. The gas forms into a large cloud that drifts across the ground.Nearby, a school bus carrying six students home from school is driving along the road. Cathy Freemont (Gale Garnett) passes the bus and waves to the children, when suddenly the large cloud of toxic gas drifts into the road. Both vehicles drive through it.Cathy arrives home, but the school bus is detained somewhere. Sheriff Billy Hart (Gil Rogers) finds the bus haphazardly parked along the side of the road, apparently abandoned in a hurry, with no sign of the children or the bus driver. Hart pays a visit to the home of Tommy Button, one of the children on the bus. Tommy lives with his mother, Leslie (Suzanne Barnes), and her female lover, Dr. Joyce Gould (Michelle Le Mothe). Leslie apparently spends her life dazed and heavily medicated, while Dr. Gould is hostile toward the sheriff for no good reason. She accompanies him to the site of the abandoned bus, where she finds Tommy's things on board. When Hart departs, Joyce goes to walk home when she spots a figure standing in a nearby cemetery. She recognizes it as Tommy, just as it disappears among the gravestones. She rushes up into the cemetery, where she stumbles across the horribly mutilated body of the bus driver; he seems to have been burned from within his clothes, his flesh horribly charred and disfigured. Suddenly Tommy appears behind Joyce, his fingernails black. Relieved, she sweeps him into a reassuring hug, suddenly screaming in agony as her flesh begins to char. Tommy's hands are roasting Joyce alive, and her burnt body falls beside that of the bus driver.The five children have been transformed into smiling zombies by the cloud of radioactive vapors, intent on burning alive anybody who comes...
A:
What happens at the nuclear power plant