Season
- Season 2 2001-10-03
- Season 1 2001-04-11
- Season 0
Special Unit 2 Season 2 The Invisible
Detectives Nick O'Malley and Kate Benson work in Special Unit 2, a secret precinct of the Chicago Police Department whose sole charge is to protect the city's citizens from Links, a malicious paranormal species that is the missing link between man and beast.
