4578 Ghost was a LEGO Xalax set released in 2001. The set is one of the nine Racers released separately that year. It also included a launcher so the car could be launched. Ghost is the only character that has a glow in the dark effect, making him unique amongst his fellow racers. He came with the second series of the Xalax Racers. He was also in LEGO Racers 2.