Swamp Thaaang!!

Swamp Thaaang!! was the film prequel to Swamp Thaaaang, a horror movie. It was the third film in the franchise. The Legends eventually fixed the timeline, erasing the film franchise from history.

History
Original timeline: In 1995 at Camp Ogawa, Maine, a displaced shtriga masquerading as camp counselor "Chad Stephens" caused the disappearance of several kids, who were drained of their life force. This tragedy presumably inspired the film franchise revolving around a swamp monster who killed people at summer camp.

Current timeline: The Legends managed to locate and bring back the life force of the missing children, and kill the shtriga, erasing the film franchise from existence.

Trivia

 * The title had three a's in the title because it was the third film in the franchise.