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Star Trek: Voyager: 2x17

Dreadnought

Stardate: 49447. When Voyager encounters a Cardassian missile ship in the Delta Quadrant named ‘Dreadnought’, B’Elanna must disarm it before it destroys a planet with millions of innocent people.

Star Trek: Voyager: Season 2 Episode 17
Feb. 12, 1996