Stardate not given: Following the trail of an alien probe, the Enterprise encounters an alien vessel that is surrounded by a magnificent energy field which proceeds to encompass the Federation ship. The alien ship transforms itself into the shape of a large feathered serpent looking like Kulkukan of ancient Mayan-Aztec legend. Kulkukan transports Kirk, Scott, McCoy, and Ensign Walking Bear to his ship to solve an enigmatic puzzle in an ancient Earth-like city. Then the crew members find themselves in a room with a variety of tamed creatures from around the galaxy in cages. When the Enterprise breaks free, the men release the Capellan power cat to distract Kulkulkan. Seeing that he is not omnipotent and that humans must be allowed to make their own decisions, Kulkulkan leaves.

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