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Cathexis

A shuttle has returned badly damaged and of its passengers, Tuvok has minor injuries but Chakotay is diagnosed as brain dead. Logs show that during an encounter with a black nebula, all of Chakotay's neural energy was depleted and would cause his death if not replenished quickly. Several inexplicable events begin unfolding after B'Elanna places Chakotay's medicine wheel above him: Paris locks helm control out and changes course twice, while B'Elanna shuts down the warp core. Kes announces she can sense an alien presence that may be possessing the officers, and because they deduce that the alien can control different people at different times, Janeway has to transfer all command codes to the Doctor - but even he is soon found deactivated.

Voyager, seizoen 1