Twisted Colossus is a steel roller coaster at Six Flags Magic Mountain amusement park in Santa Clarita, California. Originally designed and built by International Amusement Devices, the roller coaster opened as Colossus, a dual-tracked roller coaster, on June 29, 1978. It was the tallest and fastest wooden roller coaster in the world and the first with two drops greater than 100 feet (30 m). Colossus became well known after appearances in film and television, including the box-office hit National Lampoon's Vacation and the made-for-TV movie Kiss Meets the Phantom of the Park.
After more than 36 years in operation, Six Flags announced that Colossus would be closed permanently on August 16, 2014. Within two weeks of its closure, Six Flags announced that the roller coaster would reemerge in 2015 as a steel-tracked wood to steel hybrid roller coaster named Twisted Colossus. It was made by Rocky Mountain Construction to feature barrel roll inversions, a top gun stall, and 2 near-vertical drops. Twisted Colossus opened on May 23, 2015.