While visiting the newly discovered planet Phylos, Lieutenant Sulu picks up a walking plant, called a Retlaw, and is poisoned. The alien species that inhabit the planet, who are plantlike beings, approach and save Sulu's life, but kidnap Mr. Spock.

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 (Nurse Christine Chapel)
James Doohan (Lt. Cmdr. Montgomery Scott)

• This episode was written by Walter Koenig, who played Chekov in The Original Series seasons 2 and 3. Chekov does not appear in any episodes of The Animated Series and this was offered as a consolation.
  
• In addition to Scotty, James Doohan also voices Agmar and Keniclius 5 (the 5th clone of Dr. Stavos Keniclius).
  
• This episode references the classic episode "Space Seed", featuring one of the scientists responsible for creating the Augments and the subsequent Eugenics Wars.