Venom is a fictional character.
The Symbiotes ( originally known as the Klyntar ) are a fictional race of amorphous extraterrestrial symbiotes which appear in the Marvel Comics shared universe . The Amazing Spider-Man is an American comic book series published by Marvel Comics , featuring the adventures of the fictional superhero Spider-Man . Venom (comics) . Venom made his first appearance in The Amazing Spider-Man # 300 ( May 1988 ) .