Star Trek: The Next Generation (1987)

S07E16 Thine Own Self

Stardate: 47611.2. Data suddenly finds himself on an unfamiliar planet, devoid of any memories of his identity or arrival. As he navigates this new environment, he is wrongfully accused of unleashing a deadly plague on the local population. Meanwhile, Troi embarks on the bridge officer's exam, striving to earn the title of Commander.