- "The flight had a stopover on the Brain Slug Planet. Hermes liked it so much he decided to stay of his own free will."
The Brain Slug Planet is, appropriately enough, the homeworld of the Brain Slugs.
In 3001, Hermes Conrad stopped on the planet on his return from his vacation in the Spleef Nebula and thereafter had a brain slug attached to his head for a time. But he was unable to convince his coworkers to make a similar trip there.
- "Raging Bender" (mentioned only)