Lurker Monkeys (Game) is the first spin off to the Neverhood Series. It is released in November 15 2001 on the PlayStation 2, GameCube and Xbox. The story is when Dr. Kogg kidnaps the Chao Gang and takes them to the Lurker Monkey land, where they have to escape.
Dr. Kogg, fed up with the Chao Gang foiling his plans, sends his Lurker Monkeys to capture them and take them to Lurker Land, the home of the Lurker Monkeys. The Chao Gang are locked up in the Lurker Prison, where they escape and try to get back home. They explore the entire Lurker Land, fighting hordes of Lurker Monkeys and even special Lurkers.
Dr. Kogg realizes the chaos escaped and sends his Lurkers to capture them. The Chaos later got to Dr. Kogg's Castle, where they fight all of Kogg's best Lurker Warriors and Dr. Kogg himself. The Chaos then get into a rocket and blast off home to the Neverhood Island.