Klaus's human body is found, but Stan's lab ruins the body before Klaus can reclaim it. So Klaus gets revenge on Stan by switching bodies with him.
Did You Know?
In the scene where Klaus (in Stan's body) is engaging in debauchery to upset Stan the fish, the song playing is 'Be Good to Yourself' by Journey. See more
During the flashback where Francine recalls Klaus was an Olympic skier, there is a banner over the ski jump that says "1986 Winter Games." There were no winter games in 1986. The Winter Olympics did not first deviate from the year of the Summer Games until 1994. See more
References Even Stevens