Fortress of Doom

The main point of interest on Planet X; Doctor Chaotica's Fortress of Doom

For the novel of the same name, see Planet X.

Planet X was a fictional planet featured in chapter 18 of Tom Paris' holodeck program The Adventures of Captain Proton, home to Doctor Chaotica's Fortress of Doom. As a nod to the practice of re-using sets in the 1930s serials Captain Proton was emulating, Planet X looked almost identical to the mines of Mercury, though it lacked an erupting volcano. (VOY: "Bride of Chaotica!")

The Star Trek Encyclopedia (4th ed., vol. 2, p. 148) classified Planet X as a Class M world.
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