Original: The origin of the title monster combines the actual Greek myth plus the myths of Tantalus and Lycaon (and, perhaps, to a lesser extent, the origin-myth of Epaphus) In the myth, it was Theseus and not Hercules who kills the Minotaur.
Simplified: The origin of the title monster combines the actual Greek myth plus the myths of Tantalus and Lycaon.