The U.S.S. Enterprise returns to the amusement planet where the crew had once taken shore leave. The crew begin imagining their fantasies when things go wrong: McCoy envisions a southern Earth plantation, but instead the Queen of Hearts appears screaming "Off with his head!" followed by the arrival of a spear throwing deck of cards. When Uhura tries to rescue McCoy, she is captured by a hovercraft robot. McCoy informs Kirk of the dangerous situation, whereupon all crew members are recalled to the starship.

Realizing that Uhura is still trapped on the planet, Kirk attempts to contact the planet's Keeper. Kirk's landing party discovers the Keeper's tombstone, and notices that the planet, lacking the Keeper's influence, has become a dangerous world run by robots. The robots begin to pester the crew and the orbiting Enterprise.

Deep underground, Uhura tries to outwit the planet's master computer, while Kirk and Spock trick it into allowing them passage into the inner caves. The crew convince the computer of its usefulness as a peaceful and creative conscience and it ends the malfunctions on the planet and starship. While the crew returns to enjoy their shore leave, Spock continues discussions with the master computer.

Cast:

William Shatner as James T. Kirk
Leonard Nimoy as Spock
DeForest Kelley as Leonard H. McCoy
James Doohan as Montgomery Scott
Nichelle Nichols as Uhura
George Takei as Hikaru Sulu

Guest Cast:

James Doohan as Lieutenant Arex
Majel Barrett as Lieutenant M'Ress
James Doohan as Gabler
James Doohan as White Rabbit
Nichelle Nichols as Alice
Majel Barrett as Queen of Hearts

Creative Staff:

Written By: Len Jenson, Chuck Menville
Director: Hal Sutherland