Dana Elcar plays the Chief in this film due to Edward Platt's death in 1974. Barbara Feldon's character from the series, Agent 99, does not appear in film nor is she referenced; Feldon was unaware of the film's production and was not asked to reprise her role, but she said she wouldn't have accepted in any case. Sylvia Kristel, at the time well known for her appearances in the "Emmanuelle" film series, makes a brief appearance as Agent 34, with Andrea Howard as Agent 22 (in a role similar to Agent 99) and Vittorio Gassman playing the Blofeld-like villain. Joey Forman, who played Harry Hoo in the TV series, was recast as Agent 13. Pamela Hensley, who was by now well known to science fiction fans for playing Princess Ardala in "Buck Rogers in the 25th Century", appeared as Agent 36.