Living Witness (Star Trek: Voyager, Season 4, Episode 23)
An encounter between Voyager and the Kyrians is seen from the Kyrians' point of view -- 700 years in the future. In a Kyrian museum recreation of what happened, Voyager crew are all sadistic mass murderers, depicted as caricatures of themselves. The museum curator discovers a way to reactivate Voyager's holographic Doctor, who insists on setting the record straight.
Watch Star Trek: Voyager on CBS All-Access.