The leader of the IMF is initially Dan Briggs, played by Steven Hill. As an Orthodox Jew, Hill had to leave on Fridays at 4 p.m. to be home before sundown and was not available until sundown the next day.
Although his contract allowed for filming interruptions due to religious observances, the clause proved difficult to work around due to the production schedule and as the season progressed, an increasing number of episodes featured little of Dan Briggs. Hill had other problems as well.
After cooperatively crawling through dirt tunnels and repeatedly climbing a rope ladder in the episode "Snowball in Hell," in the following episode ("Action!") he balked at climbing a stairway with railings and locked himself in his dressing room. Unable to come to terms with Hill, the producers re-shot the episode without him (another character, Cinnamon Carter, listened to the taped message, the selected operatives' photos were displayed in "limbo", and the team meeting was held in Rollin Hand's apartment), and reduced Briggs' presence in the five episodes left to be filmed to a minimum.
As far as Hill's religious requirements were concerned, line producer Joseph Gantman simply had not understood what had been agreed to. He told author Patrick J. White, "'If someone understands your problems and says he understands them, you feel better about it. But if he doesn't care about your problems, then you begin to really resent him. Steven Hill may have felt exactly the same way".
Hill was replaced without explanation to the audience after the first season by Peter Graves playing the role of Jim Phelps, who remained the leader for the remainder of the original series and in the 1988–1990 revival.
Hill was replaced without explanation to the audience after the first season by Peter Graves playing the role of Jim Phelps, who remained the leader for the remainder of the original series and in the 1988–1990 revival.