The Impossible Missions Force is an elite group of agents chosen for their various abilities to infiltrate foreign governments as well as criminal organizations that are seen as threats to the security of the nation. Originally they were lead by Dan Briggs, but he was replaced by Jim Phelps after one year. Among its members are electronics executive Barney Collier, actor and master of disguise Rollin Hand, model Cinnamon Carter and strongman Willy Armitage. In later years Rollin leaves the team and is replaced by another master of disguise simply known as Paris and Cinnamon is replaced first by young Dana Lambert and then Lisa Casey.