This film is well-known to have an extremely difficult production history. The film was originally envisioned as a direct spin-off from Spider-Man 3 (2007), though Topher Grace was stated not to return to the role. Shortly after that series was rebooted, the film was announced once again, though this time within continuity of the Webb series. Chris Zylka expressed interest in playing the characters Flash Thompson iteration, which was currently running in the comics at that time. Once The Amazing Spider-Man 2 (2014) was released Sony announced Venom: Carnage would be apart of their Spider-Man Cinematic Universe. Soon after, Sony and Marvel decided to collaborate with the Spider-Man series opting to reboot again and placing a Venom spin-off on hold. Though Sony wishes to continue with their spin-offs of the Spider-Man series, no word has been announced on this films development.
In June 2017, Marvel producer Kevin Feige confirmed that the movie would not be set in the MCU, however Amy Pascal contradicted this by saying it would. It was later announced that same month that Venom is it's own Universe.
The trivia item below may give away important plot points.
The filmmakers cite the Venom comic storylines "Lethal Protector" (Venom becomes a vigilante guardian hero for San Francisco) and "Planet of the Symbiotes" (Earth is invaded by an army of symbiotes) as an influence on the film.