Killer Force, also known as The Diamond Mercenaries, is a 1976 thriller film directed by Val Guest and starring Telly Savalas, Peter Fonda and Christopher Lee.

"[2] Head of security Harry Webb fears that a diamond theft is about to take place at the company's major mining complex in the desert.

He wants to implicate Bradley in order to bring him into contact with a certain Lewis who is preparing to rob the mine with the aid of a group of mercenaries and a local accessory known as Father Christmas.

The film was based on an original script by Michael Winder which Val Guest says "wasn’t very good in the state it was in and it had an awful lot of changes to be made in it, I took it over and they brought an American writer, Gerald Sanford, and we wrote it between us.

"[2] Guest says Peter Fonda "was a gentle pain in the arse, Telly [Savalas] couldn't stand him, called him the amateur.

"[2] The film was released as Killer Force on DVD in 2013 by Metro-Goldwyn-Mayer as part of the 12 Action Adventure Movies 3-Disc set.