Kate and Nick are forced to release the original Chameleon that was imprisoned by the SU2 team so he will help them catch a new Chameleon who is now terrorizing Chicago. Nick is in a bad mood because the original Chameleon that has to help them killed his former lover.

Nick and Kate must stop the execution of a boy's father who has been wrongfully convicted of a murder committed by an invisible Boogeyman Link.

Graverobbers take a necklace from an Indian burial ground, unleashing a fire-breathing dragon that goes on a rampage through Chicago. Unfortunately, the only one at SU2 who has ever successfully fought and killed a dragon is... Carl.

Cajoled by Nick into attending her high school reunion, Kate is forced to relive the humiliation of how she ruined her graduation 10 years earlier by taking over the ceremony and hysterically insisting that Links lived in the walls of the school. Acting as her escort to the reunion, Nick helps Kate redeem her reputation when the Links return and attempt to massacre her classmates.

A Link with mind control powers sets off a crime spree using children as the perps. When Nick and Kate's investigation leads them to a really annoying kids show host, they send a bitterly reluctant Carl undercover as the host's sidekick to discover - and destroy - the Link's power.