How many Matt Helm films did Dean Martin make?

In 1965 Columbia Pictures acquired the film rights to eight Matt Helm novels. A five-film movie series was planned (four were made), which debuted with The Silencers. They were made to star Dean Martin, who co-produced with his Meadway-Claude Production company and received a partnership in the films. The series was produced by Irving Allen.

Martin played the part with his own persona of a fun-loving, easy going, wisecracking playboy with plenty of references to singing and alcohol consumption. Although unnamed in the novels, Helm's department was called Intelligence and Counter-Espionage (ICE) in the films. Like the Bond films, the Helm movies feature a number of sexy women in each, sometimes referred to as "The Slaygirls."

1. The Silencers (1966)
2. Murderers' Row (1966)
3. The Ambushers (1967)
4. The Wrecking Crew (1969)