While the U.S.S. Enterprise escorts two robot cargo ships carrying quintotriticale, a new seed grain, to famine stricken Sherman's Planet, it encounters a Klingon battlecruiser pursuing a Federation scout ship. When the Enterprise rescues the pilot, the Klingons attack with a new energy weapon and demand that the pilot be handed over to them.

George Takei (Lt. Hikaru Sulu)
Nichelle Nichols (Lt. Uhura)
Majel Barrett (Nurse Christine Chapel)
James Doohan (Lt. Cmdr. Montgomery Scott)
Stanley Adams (Cyrano Jones)

• The characters of Cyrano Jones, Captain Koloth and Korax were all introduced in the classic episode "The Trouble With Tribbles". (David Gerrold also wrote the original episode.)
  
• Stanley Adams returns as the voice of Cyrano Jones.
  
• Captain Koloth is voiced by James Doohan in this episode (of course).
  
• Cyrano Jones has had his tribbles genetically modified so they don't reproduce. Unfortunately, they grow very large. (They are also bright pink.) He also has a tribble predator called a glommer.