The cyclops was a one-eyed species on the planet Preplanis.

The Robinsons encountered a giant specimen and supposed the creature was a mutant humanoid plant. ("There Were Giants In The Earth") It is possible that this individual ate some of the fruit shown in "The Oasis" and grew large as a result.

Other members of this species were among the specimens collected by the Keeper, though they were not giants. ("The Keeper: Part 1")


  • The Bog Monster was possibly a mutated member of this species.

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