Capt. J. (Jeroboam) Barker-Rynde PI (played by Terry-Thomas) is a protagonist in Kill or Cure.
Rumbelow (played by Eric Sykes) appears in Kill or Cure.
Det. Insp. Hook (played by Lionel Jeffries) appears in Kill or Cure.
Dr. Julian Crossley (played by Dennis Price) appears in Kill or Cure.
Richards (played by David Lodge) appears in Kill or Cure.
Frances Roitman (played by Moira Redmond) appears in Kill or Cure.
Burton (played by Ronnie Barker) appears in Kill or Cure.
Roger Forrester (played by Derren Nesbitt) appears in Kill or Cure.