Gamma Hydra II
Gamma Hydra II was the second planet in the Gamma Hydra system of the Beta Quadrant. This planet was located in both the administrative area of Starbase 10 and the Gamma Hydra sector.

When crewmembers of the , including Captain Kirk were afflicted by radiation on Gamma Hydra IV, causing them to age rapidly, Kirk several times mistakenly stated that the Enterprise orbited Gamma Hydra II because of the decreased mental capabilities due to his "old age". ()

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Gamma Hydra 02