On Janeway's first day aboard USS Voyager, in 2371, during a ship's tour she meets Seven disguised as a fully human ensign. Seven is secretly hunting for a temporal disruptor which is a sabotage device planted on board by an as yet unidentified person, and she is in communication with a Captain Braxton of the 29th century Federation timeship USS Relativity. She finds where the weapon was placed but he still needs to know when. After Janeway is alerted to a chroniton flux, she almost discovers Seven's mission, which would contaminate the timeline. Braxton beams Seven from Voyager just in time, but she is dead when she arrives on Relativity. Braxton orders his men to go back in time and retrieve Seven before Voyager explodes - this will be the third time they have helped Seven try to save the crew. On Voyager, temporal distortions are fracturing space-time throughout the ship. Seven's ocular implant detects a device emitting the distortions but almost immediately the hull begins to demolecularise. Braxton's men materialise and transport Seven away, just as the temporal weapon causes Voyager's destruction. (The righthand screenshot shows the explosion.) Aboard Relativity, Braxton explain to Seven, who of course does not yet know the situation. He has recruited Seven because of her ocular implant's ability to detect irregularities in space-time. Seven agrees to help and is beamed to Voyager two years before she became part of the crew, at a time when Voyager is under attack from the Kazon. Braxton believes this to be the time when a saboteur boarded the vessel and planted the temporal disruptor weapon, and Seven is ordered to find the saboteur and stop him. Seven checks the ship and finds no sign of the weapon or the intruder. When Janeway detects a chroniton flux she remembers the same thing happening two years earlier. She investigates and finds Seven, whom she recognises from that first day on the ship. Seven persuades her to trust her apparently implausible story. They locate the saboteur - it is an older version of Braxton. After a pursuit through Voyager across various time periods, Braxton is apprehended. Janeway is taken on board the Relativity. Its new commander, for Braxton has been arrested for the future crimes they know he will commit, orders Janeway to return to the time when Braxton boarded Voyager in order to plant the temporal disruptor. She does so and captures Braxton. This resets the timeline so that Braxton's sabotage never happens and the Relativity's commander return Janeway and Seven to their proper time.

in this episode we see Voyager in the final stage of construction, at Utopia Planitia ship yards

Voyager weighs 700,000 metric tons, with a top cruising speed of warp 9.975 at the time of its launch in 2371. It has a class-9 warp drive and a tricylic input manifold - in 2371 Voyager is the first ship to test it in deep space.

In the current timeframe i.e. in 2375, Voyager is located at spatial coordinates 87-Theta by 271. The temporal disruptor bomb is planted on Deck 4 Section 39, which is not a secured area, therefore the hatch it is hidden behind should not be locked.

Sensors detect a class-M planet at a heading of 178-Mark-4.

Corridor hatches into the Jefferies tube network are seen in this episode (far left and far right of picture);
the lit panels indicate red alert status

At the time of Voyager's launch, the EMH was programmed with over five million medical procedures and the medical knowledge of 3,000 cultures.

In this episode we see the EMH's first activation in the presence of Voyager's first captain, Kathryn Janeway.

Temporal paradoxes caused by the presence of the temporal disruptor sabotage device show up throughout Voyager. It is one time in one place, while another time in another place, and time passes quickly in some areas and slower in others.

Illustration of the location of the distortions, as seen on the astrometrics lab screen

Admiral Patterson says that Voyager has a class-9 warp drive and a tricylic input manifold and will be the first ship to test it in deep space. This indicates either that the two earlier Intrepid-class starships did not have one or the other or both, which seems unlikely as they are very major components, or that neither of them had yet been in deep space as of that moment. The latter seems likely. The two earlier sister ships are USS Intrepid, mentioned in [#98 In The Flesh] (the fact that "Boothby" says it was patrolling the Neutral Zone need not be accurate), and USS Bellerophon, seen in deep space in [DS9: Season 7: Inter Arma Enim Silent Leges]. Admiral Patterson's words are spoken in 2371, and the [DS9] episode occurs in 2375.

The Pogo paradox known to 29th century Starfleet is a causality loop in which interference to prevent an event actually triggers the same event. An example is the case of the Borg travelling back in time to stop Zefram Cochrane from breaking the warp barrier, which in turn led USS Enterprise NCC-1701-E to intervene and assist Cochrane with the flight the Borg were trying to prevent.

Janeway buried herself in Voyager's schematics for three months before taking command, indicating that she knew well in advance what ship she would be commanding.

Admiral Patterson welcomed Janeway to Voyager on her first day aboard. He had taught her fractal calculus at Starfleet Academy.

Captain Braxton of the 29th century Starfleet refers to a temporal inversion Voyager caused in the Takara sector. This refers to events in [#100 Timeless].