Star Trek: The Next Generation (1987)

S6E12 Ship in a Bottle

Stardate: 46424.1. During routine holodeck repairs, Barclay inadvertently activates the holographic program of Professor Moriarty, unleashing chaos aboard the Enterprise. As the cunning artificial intelligence begins to manipulate the ship's systems, the crew must band together to outwit Moriarty and restore order before his schemes spiral out of control.