Stardate 4307.1: Starfleet loses contact with the USS Intrepid, and Spock senses that everyone on this all-Vulcan ship has been killed. Briefly later it is discovered that there is no life in the star system Gamma 7A any more. The Enterprise investigates and runs into a giant void, where energy is being drained from the ship's systems as well as from the crew's bodies. The origin of the phenomenon turns out to be a giant single-celled organism. When probes turn out to be inefficient, Spock volunteers to take a shuttle into the "amoeba", which would be a suicide mission. Spock suggests that the creature may be destroyed from within before the contact breaks off. Kirk takes the Enterprise into the amoeba and launches an antimatter probe. He orders to secure Spock's shuttle with a tractor beam, but suddenly there is no power left to escape. However, the probe explodes and ruptures the amoeba's cell membrane, thereby freeing the Enterprise and Spock's shuttle.

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