Stardate 3614.9: Scotty is found beside a brutally knifed woman on the hedonistic world of Argelius, but he can't remember anything. Kirk orders Lt. Karen Tracy to examine him with a psychotricorder, but she too is killed when the two are alone. The Argelian official Jaris proposes to find the truth in an ancient empathic ceremony, in the course of which the medium, his wife, is stabbed just as well. Kirk decides that the trial should be continued on the Enterprise. The computer-assisted interrogation and databank research comes to the conclusion that the actual murderer is named "Redjac" aka "Jack the Ripper", an alien entity that subsists on fear and that is traveling from planet to planet. It was hiding in the body of the local administrator Hengist, and now takes control of the ship's computer. With the the help of an unsolvable puzzle and tranquilizers for the crew Redjac can be finally expelled from the computer. It returns to Hengist's body and is beamed out into space.

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