Mr. Complain always has something to grumble about, even as he takes a spectacular train ride through mountains, volcanoes, caves, and oceans, but as his trip comes to an end he realizes he genuinely enjoyed the journey and is ready to go again.

When a boy asks his mother why he must make his bed, she tells him a story about his ancestors who posed the same question through the centuries, going all the way back to a caveboy and his mother.