Time and Again is the fourth episode of the television series Star Trek: Voyager. A television program is the content of television broadcasting. ... The starship Voyager (NCC-74656), an Intrepid-class starship. ...

Story line

Paris and Janeway, stuck in the past

The crew of Voyager detect a massive 'polaric' detonation and encounter as its source a devastated planet, with remains of a civilization, and later discover temporal anomolies on its surface during an away mission. Captain Janeway and Lieutenant Paris get caught in a time fracture on the planet and travel back in time by a single day to a bustling civilization, before the detonation has occurred. The USS Voyager (NCC-74656) is an Intrepid class starship in the Star Trek fictional universe. ... Janeway redirects here. ... Thomas Eugene Paris is a character in the fictional Star Trek universe who served aboard the USS Voyager (NCC-74656) as helmsman and pilot, with the rank of lieutenant. ...

It transpires that the civilization uses polaric energy as an energy source. After encountering protesters who are opposed to this energy source, and being accused of infiltrating the protest group as a government spy, Janeway learns of a planned terrorist act and suspects that it is responsible for the detonation which destroys the planet.

Being held as a hostage by the group inside the polaric energy facility after a forceful invasion, an opportunity arises for Janeway to prevent the terrorists from carrying out their sabotage and she holds them at gunpoint.

Meanwhile (one day in the future), the crew of Voyager have been researching ways to rescue Janeway and Paris using the time fractures. On the advice of Kes, whose undeveloped psychic senses detect Janeway's presence in the past at a particular location on the planet, the rescue team create a temporal rift. Jennifer Lien as Kes Kes is a character in the Star Trek fictional universe, played by Jennifer Lien in the television series Star Trek: Voyager. ...

The temporal rift exits one day in the past at the same location, near Janeway, and it then transpires that it is the crew's own rescue attempt which causes the polaric detonation by forming a dangerous rift inside the polaric energy plant. Janeway uses her weapon to close the rift, at which point the timeline is destroyed and the story appears to begin again.

No such detonation is detected however, and in place of a devastated planet, a pre-warp civilization is discovered. No one except for Kes is aware of the events which took place in the alternate timeline. Only the viewers know that Kes's mysterious abilities are accurate, because at the end of the episode, after the alternate timeline is negated, the crew responds to her vision but finds nothing.

Significant character development

• Kes' undeveloped psychic abilities become more apparent to other members of the crew, though not after the timeline is restored.
• The Doctor shows exasperation at the lack of information disclosed to him.