The Enemy Within

Main Cast

 * William Shatner as James T. Kirk
 * Leonard Nimoy as Spock
 * DeForest Kelley as McCoy
 * James Doohan as Scott
 * George Takei as Sulu
 * Nichelle Nichols as Uhura

Guest Stars

 * Grace Lee Whitney as Rand
 * Jim Goodwin as John Farrell
 * Ed Madden as Fisher
 * Garland Thompson as Wilson

Non-Canon Links

 * This episode was novelized in Star Trek 8 by James Blish