The whereabouts of a list of enemy agents operating in the United States is locked in the memory of a captured spy, Col. Vanin (guest star Frank Marth), and no one, including the spy, can penetrate his mind in "The Party" on Paramount Television's "Mission: Impossible."The whereabouts of a list of enemy agents operating in the United States is locked in the memory of a captured spy, Col. Vanin (guest star Frank Marth), and no one, including the spy, can penetrate his mind in "The Party" on Paramount Television's "Mission: Impossible."