While exploring on the outermost rim of the galaxy the U.S.S. Enterprise is pulled into the orbit of a dead star. Trapped there, the crew discovers that there is an ancient derelict pod ship trapped with them as well.

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 (Enterprise Voice)
James Doohan (Lt. Cmdr. Montgomery Scott)

• Many of the Season 1 animated series episodes were intended to be part of the Original Series Season 4 had the series not been canceled.
  
• Gene Roddenberry did not consider the events of The Animated Series to be canon, though many events and character development did work their way into subsequent series.
  
• In addition to voicing Scotty, James Doohan voiced most of the other unnamed characters.
  
• This is the first appearance of the navigator, Lt. Arex, who has taken over for Chekov.