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The Alternative Factor

The Enterprise encounters brief but intense turbulence after entering orbit above an uninhabited world. Kirk leads a landing party to the surface to investigate any possible connection between the planet and the disturbance, and they find a man named Lazarus, who, though he seems healthy and normal, claims to be fighting his own equivalent from a universe of antimatter. Lazarus proves to be a threat to the Enterprise's security, and the increasing blasts of turbulence seem to confirm Lazarus's story that he has a powerful enemy in another dimension.

The Original Series, seizoen 1