Star Trek: The Next Generation (1987)

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Set almost 100 years after Captain Kirk's 5-year mission, a new generation of Starfleet officers set off in the U.S.S. Enterprise-D on its own mission to go where no one has gone before.

Lonely Among Us (Season 1, Episode 6 )
While distracted by two antithetical races applying for Federation membership, the Enterprise picks up a sentient entity that can alternately possess either man or machinery.

The Mind's Eye (Season 4, Episode 24)
Geordi is brainwashed by the Romulans to start a war between the Klingons and the Federation

The Game (Season 5, Episode 6)
Wesley Crusher returns to the Enterprise on vacation from the Academy only to discover a mysterious alien game infiltrating and controlling the crew.