"Is There in Truth No Beauty?" is the fifth episode of the third season of the American science fiction television series Star Trek. Written by Jean Lisette Aroeste and directed by Ralph Senensky, it was first broadcast on October 18, 1968. In the episode, the Enterprise travels with an alien ambassador whose appearance induces madness. This episode was the second appearance of Diana Muldaur in the Star Trek franchise. She appeared previously as Dr. Ann Mulhall in the second season episode, "Return to Tomorrow" and would later appear as Dr. Katherine Pulaski in the second season of Star Trek: The Next Generation. Plot The Federation starship Enterprise is assigned to escort Medusan ambassador Kollos and psychologist Miranda Jones to a rendezvous with a Medusan vessel. Medusans are non-humanoid creatures whose outward appearance is described as being so ugly as to cause humanoids who see them to go insane and then die. Kollos travels in a carrier to hide him from view, and First Officer Spock assists as necessary using a special visor which allows his Vulcan psychology to withstand the sight of Kollos. Jones is also able to observe Kollos with the help of the visor, a fact which she claims is due to Vulcan-style mental discipline. At a dinner with Captain Kirk and the senior officers, Jones, a telepath, explains that her assignment is to attempt a mind link with Kollos in the hope of allowing Starfleet to utilize the Medusan's unique senses and navigational abilities. In the course of the discussion, Jones breaks off, sensing someone nearby with murderous intentions. She then returns to her quarters, where she is visited by her associate Lawrence Marvick. Marvick is in love with Jones, a feeling which she does not reciprocate, and she senses that he is the would-be murderer. He then makes his way to Kollos's quarters with a phaser, but is overcome by the sight of the Medusan before he can fire. Now insane, Marvick rushes to Engineering, overpowers and renders unconscious Chief Engineer Scott and other crew members, and takes control of the engines. The Enterprise quickly accelerates past Warp Factor 9.5, which takes it far outside of the galaxy and into a strange swirling void. Marvick, now restrained, screams wild accusations at Jones before he dies. With no navigational references, the Enterprise crew cannot return home. Kirk suggests that Kollos's superior navigational abilities could be of use,