The film ends with the announcement of a fifth Matt Helm film, "The Ravagers" (which would have been based upon Hamilton's 1964 novel of the same title). However, Martin declined to return for another film in despair over the murder of Tate six months after the film's release. When Martin refused to make "The Ravagers," Columbia held up Martin's share of the profits on the second Matt Helm film, "Murderers' Row". The project was then cancelled.