"David Callan, secret agent, is called back to the service after his retirement, to handle the assassination of a german businessman, but Callan refuses to co-operate until he finds out why this man is marked for death."
Edward Woodward
as David Callan
Eric Porter
as Hunter
Carl Möhner
as Schneider
Catherine Schell
as Jenny
Peter Egan
as Toby Meres
Russell Hunter
as Lonely
Kenneth Griffith
as Waterman
Michael Da Costa
as The Greek
Veronica Lang
as Liz, Hunter's Secretary
Clifford Rose
as Dr. Snell
David Prowse
as Arthur
Don Henderson
as George
Nadim Sawalha
as Padilla
David Graham
as Wireless Operator
Yuri Borienko
as Security Porter
Peter Symonds
as Smart Security Man
Raymond Bowers
as Shabby Security Man
Joe Dunlop
as Policeman
Mollie Maureen
as Old Lady in the Strand
Anne Blake
as Flag Lady
James Mitchell
Author
Don Sharp
Director
Lesley De Pettit
Casting
John Clark
Art Direction
Wilfred Josephs
Original Music Composer
Teddy Darvas
Editor
Derek Horne
Producer
Harry Benn
Associate Producer
Ernest Steward
Director of Photography