Invasion was a 2001 professional wrestling pay-per-view (PPV) event produced by the World Wrestling Federation. It took place on July 22, 2001, at the Gund Arena in Cleveland, Ohio. The event had been promoted as the fourth Fully Loaded at the preceding King of the Ring event, but WWF changed it to Invasion in May. Invasion was the first pay-per-view to feature the ongoing Invasion storyline, which featured wrestlers from the WWF taking on The Coalition, a combined force of wrestlers from the former World Championship Wrestling (WCW) and Extreme Championship Wrestling (ECW) promotions, later known as The Alliance.