As I was saying over on Guy-Wires, my gaming group convinced me into combining Torgon the Eviscerator (Space Tyrant and future Drama Critic) with my Greek Heroic Age campaign. Further, they convinced me to let them play henchme-for-hire to Torgon (part of an intermittently-utilized campaign framework we came up with a couple of years ago).
Back before I made the henchmen connection, I had another idea. "Mazes & Minotaurs" is the game that inspired my Greek campaign idea, although I wanted to run an Earth-based version of ts world of Mythika. (The conceit of M&M is that it's what the first RPG would have been like if it had been based on movies like "Jason and the Argonauts" and those Italian "Hercules" movies instead of Medieval miniatures games.) I wanted to take the same ideas and run it in a wacky version of Ancient Greece (I've got a lot of games based on Ancient Greece, so I have maps, locations, NPCs, etc.). Amongst the many creatures in the M&M bestiary is a race called Derros.
There's also a race called Derros in Dungeons and Dragons, but it's not really a case of one game plagiarizing the other. In the 1940s, the science fiction magazine Amazing Stories started running a series known as "The Shaver Mysteries" (after the author, Richard Sharpe Shaver, who claimed that these stories were true). The stories claimed that humans were being tortured physically and mentally tortured by a race of stunted, subterranean dwarfs named (wait for it) Deros. Though they lived primarily in cavern cities, they sometimes travelled in rockets and saucers (remnants of ancient Lemurian technology) and visited the outer Earth. Also, it is said, they made contact with evil inhabitants of outer space.