Mission: Impossible is an American television series created and initially produced by Bruce Geller, chronicling the exploits of a team of secret government agents known as the Impossible Missions Force (IMF). In the first season, the team is led by Dan Briggs, played by Steven Hill; Jim Phelps takes charge for the remaining seasons, played by Peter Graves. Each episode opens with a fast-paced montage of shots from that episode which unfolds as the series' theme music plays, composed by Lalo Schifrin, after which Briggs or Phelps receives his instructions from a voice delivered on a recording which then destroys itself.