Detective Dave Quinn / Detective David Quinn / Quin (14 episodes, 1973-1974)
Liz Roman, Dr. Erickson's assisant / Liz Roman / Liz (6 episodes, 1974)
Detective George Kaminski / Detective Kaminski / Kaminski (6 episodes, 1974)
Poulis (4 episodes, 1974)
Detective Sergeant Jim Brewer / Brewer (3 episodes, 1974)
Detective Sergeant Richard Tremblay / Det.Sgt. Richard Tremblay (3 episodes, 1974)
Boyer (3 episodes, 1973-1974)
Dr. Charles Erickson / Erickson (2 episodes, 1974)
Bourke (2 episodes, 1974)
Ryan (2 episodes, 1974)
Adams (2 episodes, 1974)
Edna (2 episodes, 1974)
(1 episode, 1974)
Gerry (1 episode, 1974)
Fielding (1 episode, 1974)
Old Woman (1 episode, 1974)
MacDonald (1 episode, 1974)
Doyle (1 episode, 1974)
(1 episode, 1973)
Santos (1 episode, 1973)
Drew (1 episode, 1973)
Julia (1 episode, 1973)
Louisa (1 episode, 1973)
Jennie (1 episode, 1974)
Mr.Vincent (1 episode, 1974)
Lloyd (1 episode, 1974)
Judge Manly (1 episode, 1974)
Walsh (1 episode, 1974)
Jack (1 episode, 1974)
Andrea (1 episode, 1974)
Hall Manly (1 episode, 1974)
Hanna (1 episode, 1974)
Candy (1 episode, 1974)
Doug (1 episode, 1974)
Jimmy (1 episode, 1974)
Sonny (1 episode, 1974)
Agnes (1 episode, 1974)
Twink (1 episode, 1974)
Kidnapper (1 episode, 1974)
Bystander (uncredited) (1 episode, 1974)