Star Trek: The Next Generation (1987)

S2E21 Peak Performance

Stardate: 42923.4. Chaos erupts when a Ferengi vessel inadvertently discovers a war game in progress between Riker and Picard, each commanding their own starship. Seizing the opportunity, the Ferengi launch an assault on both ships, disrupting the simulated conflict and forcing the crew to unite against a common enemy.