Leonard Nimoy becomes a member of the Impossible Missions Force and, as Paris of the IMF, helps crack a vital code by hijacking a plane so the enemy can capture one of the passengers, in the fourth season premiere episode of Paramount Television's "Mission, Impossible."Leonard Nimoy becomes a member of the Impossible Missions Force and, as Paris of the IMF, helps crack a vital code by hijacking a plane so the enemy can capture one of the passengers, in the fourth season premiere episode of Paramount Television's "Mission, Impossible."