As a landing party prepares to beam down to a previously unexplored Class-M planet, a beautiful woman appears in the transporter room and kills an ensign with a touch. Already dematerializing in the transporter beam, Kirk and the rest of his party are helpless to stop her. The surge of power her appearance caused hurtles the Enterprise 990 light years and 12 hours away from the planet. On the surface, the woman appears again, this time killing Lt. D'Amato. The landing party finds a computer, the last remnant of an ancient Kalandan civilization, which is creating the projects of the woman, Losira.

James Doohan (Lt. Cmdr. Montgomery Scott)
Lee Meriwether (Losira)
Arthur Batanides (Lt. D'Amato)
George Takei (Lt. Hikaru Sulu)
Nichelle Nichols (Lt. Uhura)
Naomi Pollack (Lt. Rhada)
Booker Bradshaw (Dr. M'Benga)
Brad Forrest (Ensign Wyatt)
Kenneth Washington (John B. Watkins)