Scrooge McDuck takes his nephews to the planet Earth, which is actually a hollow shell protecting an inner world. When Huey, Dewey and Louie are separated, the trio must rely on their wits and a quirky underground civilization to find their way home.
"He was never in time for his classes… He wasn't in time for his dinner… Then one day… he wasn't in his time at all."
Marty McFly, a typical American teenager of the eighties, is accidentally sent back to 1955 in a plutonium-powered DeLorean "time machine" invented by his slightly mad scientist friend Dr. Emmett Brown. He must make sure his teenage parents-to-be meet and fall in love — so he can get back to the future.