The Immunity Syndrome
Summary
The crew of the Enterprise encounters an energy-draining space creature. On their way to Starfleet Command base 6, the Enterprise receives orders to check on Starship Intrepid in Gamma 7 solar system. They find a black space covering the path to the system with no stars visible through it. Upon crossing into the space, the Enterprise begins to lose energy and is pulled towards a single-celled organism that is massive in size. After losing two probes to investigate the organism and failing in an attempt to pull away, Kirk chooses Spock to take the shuttlecraft into the organism membrane, investigate it and find a way to destroy it. Spock finds that the organism is about to reproduce and has a nucleus that can be attacked with a full charge of antimatter energy.
Summary from Wikipedia, CC BY-SA 4.0.
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