A mere six months older, Jan returns to Earth after eighty years hitchhiking the galaxy.
The Overlords treated him well during his stay—they hadn't even been all that surprised to find him on the ship, which Jan found a wee-bit disappointing.
Their world was so technologically advanced that Jan felt like a man from the Stone Age dropped into the modern world.
An Overlord named Vindarten took charge of Jan and did what significantly advanced aliens do with a human in their midst: experiments and research.
During one of his first trips outside—not that he could go anywhere on his own, since he can't fly like the Overlords—Vindarten took him to a museum and showed him the Earth exhibit, filled with the ever advancing technology of Earth's many civilizations.
One of the other exhibits frightens Jan something awful: a giant eye from a extraterrestrial beasty, but Vindarten doesn't understand his startled reaction.
Other wonders of the Overlord world include a creature Jan mistakes for a mountain stalking across the horizon.
Vindarten refuses to let Jan take a picture of the creature, and Jan realizes the Overlords have masters, too.
When the ship touches down on Earth, Karellen is already waiting for Jan.