Star Trek: The Next Generation (1987)

S5E6 The Game

Stardate: 45208.2. An insidiously captivating game spreads among the Enterprise crew, compromising their ability to think rationally and making them susceptible to external influence. Fortunately, a resourceful young Ensign and a vacationing Wesley Crusher remain unaffected. Together, they must devise a plan to counteract the game's effects and restore the crew's autonomy before the ship is seized by adversaries.