Main Characters Alison Dangerfield 1 main appearances Dr. Nick MacKenzie 1 main appearances Dr. Shaaban Hamada 1 main appearances Marty Dangerfield (1995) 1 main appearances Dr. Paul Dangerfield (1995-1997) 1 main appearances Dr. Joanna Stevens (1995) 1 main appearances Sgt Keith Lardner Marty Dangerfield (1996-1997) Dr. Jonathan Paige (1997-1999) DS Helen Diamond (1996-1999) Matt Gregory (1999)