After winning a trip to Earth, the Doctor (Sylvester McCoy) and Mel (Bonnie Langford) prepare for a vacation in Disneyland, made all the more magical by a time-traveling spaceship that will take them to the year 1959. But their plans are smashed when the ship crashes into a satellite. While they wait in a holiday camp, they become embroiled in an intergalactic plot involving a pregnant queen and menacing Bannerman who want to see her dead.