|This season saw the departure of what was the critical part of the show's first three years: Martin Landau and Barbara Bain. Paramount (and executive Douglas Cramer) didn't want to pay Landau who demanded money in excess of Peter Graves, who had an exclusive contract guaranteeing that he would be the top earner on the show, and then the studio felt obliged to let his wife Bain go as well. Or so some stories claim: the Landaus asserted they were forced out and both sides have stuck to their stories in the subsequent decades. Greg Morris managed to get a raise out of Paramount, who didn't want to lose anyone else.|
With the absence of Landau to play Rollin Hand, the studio hired a new master of disguise: the Amazing Paris, played by Leonard Nimoy. Nimoy played a much less flamboyant individual but was given a chance to expand his acting range after three years of Star Trek, which had just been canceled.
The show was left without a female lead and a number of actresses were rotated through the role. The only one who caught on was Lee Meriwether (who had previously appeared as a different character) as Tracey. Meriwether played in six different episodes.
Producer Stanley Kallis left for Hawaii 5-0, and the studio hired Bruce Lansbury, whose series The Wild Wild West had just been canceled. Accustomed to juggling gadgetry and plot twists, Lansbury fit in well and would stay with the series through its remaining years. He also kept the show on budget, which had been a constant problem under Bruce Geller.
Staff writer Paul Playdon left after confessing burnout. Laurence Heath came in as story consultant. And female costumer Sabine Manela passed away of cancer with Dodie Shepard taking her place.
With all the changes, the show didn't do well this season. The series dropped in the ratings from an overall 11 to 53. Paramount was happy because Lansbury brought the show in on time and on budget. The show only received six Emmy nominations, its lowest to date, including Greg Morris for Supporting Actor. Peter Graves won a Golden Globe for his work on the show.