DI Jack Frost
Supt. Mullett
Pam Hartley
DS George Toolan
WPC Ronnie Lonnegan
Babcock, HMI
Arnold Harris
Mike Patterson
Harry Monkton
Fiona Monkton
Melanie Monkton
Jeffrey Meadows
PC Ernest 'Ernie' Trigg
Sgt. Don Brady
Walter
Dr. McKenzie
Tony Chalmers
Evelyn Post
Lionel Grange
Paul Mathews
Tessa Meadows
Billy Simpson (as Elliott Young)
Susan Talbot
Officer
Steve Nesbit
Engineer
Mrs. Malloy (as Phyllis McMahon)
Jean Harris (uncredited)
P.C Mathers (uncredited)