This is a list of recurring fictional characters in the original television series Mission: Impossible.
The cast changed considerably episode-by-episode throughout the program's seven-year run, so not all of the characters listed above took part in every mission that season. Many missions used one-time agents who were brought in as guest stars. Often, these agents were brought in for a specific skill, such as a pathologist, a psychic medium, or a contortionist.
Daniel "Dan" Briggs’s main role in the team was as its "captain"; he received the instructions from the 'Voice on Tape', and selected and coordinated the best people for the mission at hand. The team frequently consisted of Cinnamon Carter, Willy Armitage, Barney Collier, and Rollin Hand, although Briggs did not always use all of these team members and often also used other agents. He briefed the team, then if needed, handed out extra disguises or devices. Though Briggs played a significant role in many of the first-season missions, he was not an active participant in seven of the 27 missions he co-ordinated; after the mission briefings for these particular missions, Briggs did not join the team in the actual execution of the plan, evidently confident that his hand-picked team would succeed without his direct involvement.
As was the case with most characters in the series, Briggs's background and personal life were never explored in detail. The first mission of the series indicated that he had not worked with the IMF for some time prior to that mission. (The 'Voice on Tape' ended the first mission's instructions with the statement, "I hope it's welcome back, Dan. It's been a while.") Another mission, "Old Man Out", revealed that he had once romanced an IMF agent played by Mary Ann Mobley. The only other insight into Briggs's personal life was his one off-book mission, "The Ransom", where the daughter of a personal friend of Briggs', a school teacher, is kidnapped to force Briggs to deliver a mob informant from police custody before he can testify before the grand jury.
Briggs was depicted at times as a cold, calculating character, quite willing to kill to complete a mission. Notably, he was the only member of the IMF shown personally killing a nontarget in anything other than self-defense, when he ambushed and killed a sentry to get through a checkpoint in "The Carriers". At other times, he exhibited a fatherlike attitude towards his agents, and was frequently seen smiling encouragement and patting shoulders as missions progressed. Several episodes, such as "Shock", revealed that Briggs had acting, voice mimicry, and disguise abilities similar to those of one of his agents, Rollin Hand.