In the shuttlecraft Copernicus, Mr. Spock, Uhura and Sulu are en route to Starbase 25 to deliver a stasis box — a rare artifact of the Slaver culture — when the Kzinti intervene.

William Shatner (Captain James T. Kirk)
Leonard Nimoy (Commander Spock)
DeForest Kelley (Dr. Leonard H. McCoy)

George Takei (Lt. Hikaru Sulu)
Nichelle Nichols (Lt. Uhura)
Majel Barrett (The Slaver Weapon)
James Doohan (Chuft Captain)

• This episode was adapted by Larry Niven from his own short story "The Soft Weapon".
  
• The Slavers were a race that ruled the galaxy a billion years ago. During the Slaver Wars, a revolt led to their extermination.
  
• Captain Kirk does not appear in this episode, nor does Dr. McCoy. This is the only episode of TOS or TAS where Kirk does not appear.
  
• This is the only Star Trek episode that does not have any scenes that take place on the Enterprise.
  
• Sulu notes the Kzinti have had four wars with Humans, the last 200 years prior. (This does not fit with the timeline established by canon.)