Venom or the venom symbiote is a fictional extra terrestrial life form appearing in books published by marvel comics usually those featuring spider man the creature is a symbiote a sentient alien with a gooey almost liquid like form that requires a host usually human to bond with for its survival as with real world symbiotes and to whom it endows enhanced powers when the venom symbiote bonds with a human that new dual life form refers to itself as venom the symbiote39s first known host was spi