Star Trek: Voyager, season 1, episode 4
Time and Again
Summary
Investigating a planet just devastated by a polaric explosion, Janeway and Paris are engulfed by a subspace fracture and transported in time to before the accident.
Summary from Wikipedia, CC BY-SA 4.0.
Find out more
These links open the services in a new tab with the question pre-filled; the AI assistants may ask you to sign in. Their answers can contain errors.