"When Worlds Collide" is a single of the heavy metal band Powerman 5000 from their album Tonight the Stars Revolt!. The song is virtually always the last song to be played at concerts. It is one of the band's most well-known songs and has been used in the video games Tony Hawk's Pro Skater 2, WWE Smackdown! vs. Raw, and in the 2000 film Little Nicky. It is also used as Purdue University's entrance music for football games. Spider has stated that the song is about social classes.