 A construction crew is trying to launch a booster rocket to attach to an approaching comet. Once attached, the rocket will push the comet out of a collision course with an inhabited planet. But a mysterious ghost appears, spooking the crew with its mysterious, unintelligible moans. When Buzz and his team arrive, the crew take their ship to escape. The rangers then complete the booster rocket, and Buzz takes off with it to install on the comet. The ghost tries to stop Buzz s ship, but the cadets attach the ghost and Buzz is away. Once in the comet s tail, Buzz finds it difficult to fly and aim the booster, and is eventually foiled by an ice boulder that smashes his ship. Flying loose, Buzz sees an antique ship floating amongst the ice boulders. He enters it and finds the pilot, Wild Bill Cooley, who has been accidentally cryofrozen for 50 years. Thawing him, Buzz finds out that Cooley had tried to deflect the comet 50 years before, but had been foiled and frozen. From his frozen state, he had sensed the construction crew s activity and tried to warn them with the message "no one alone", but it came out backward. Now with two people manning Cooley s ship, Buzz navigates it while Cooley aims the booster rocket to the comet. They successfully deflect the comet, saving the planet.