Kirk and McCoy decide to take Scotty, who is recovering from a head wound accidentally caused by a female crew member, to a nightclub on the planet Argelius II. Scotty becomes infatuated with a lovely dancer at the club and they leave together. In the meantime, Kirk and McCoy decide to sample some of the planet's other pleasures and leave. A scream sends them to a foggy alley to find the dancer dead with Scotty holding a bloody knife.

John Fiedler (Commissioner Hengist)
Charles Macauley (Prefect Jaris)
Pilar Seurat (Sybo)
James Doohan (Lt. Cmdr. Montgomery Scott)
George Takei (Lt. Hikaru Sulu)
Charles Dierkop (Morla)
Joseph Bernard (Tark)
Tania Lemani (Kara)
John Winston (Lt. Kyle)
Virginia Aldridge (Lt. Karen Tracy)
Judith McConnell (Yeoman Tankris)
Judi Sherven (Nurse)

• Kirk and McCoy took Scott to Argelius because he was suffering from "total resentment of women" because a woman caused his concussion.
  
• The murderer, inhabiting Hengist's body, is an alien creature known as Redjack a/k/a Jack the Ripper. The alien consumes the emotion of fear, killing women because they frighten more easily.
  
• John Fiedler was an odd choice for Hengist, who seemed too wimpy and goofy to be inhabited by a serial killing alien. (Fiedler is known for his role on "The Bob Newhart Show" and has been the voice of Pooh's little friend Piglet since 1968.)
  
• Spock used the transporter to disperse Hengist's body and the creature into space.
  
• Scott's home town is Aberdeen, Scotland, UK.
  
• The close-up shots of Scott's hand on the computer witness stand are not of James Doohan's hand. (He is missing a finger on that hand.)