Who killed Mr. Boddy? Was it Colonel Mustard in the study with the gun? Miss Scarlet in the billiard room with the rope? Or was it Wadsworth the butler?

Danny twists the key of an old science fiction game. The game unleashes a localized meteor shower and wrenches Danny's house into orbit around a distant ringed planet. Besides Danny, his brother Walter and sister Lisa have to go along. Soon a defective robot, a rangy astronaut, and an alien spaceship enter the picture. The only way the kids can return their house to its proper space-time coordinates is to finish the game, but before they can finish,...