First aired in 1998.
The ship and crew find themselves journeying through a starless, inky-black emptiness, they call The Void, in an attempt to get back home. But only 53 days into the two-year journey through the stellar "night," the crew is already on edge. Worst of all, Captain Kathryn Janeway has retreated to her quarters, avoiding the crew and ruining her decision to take this course. Suddenly, the ship grinds to a halt and the lights go out. Soon, strange aliens begin appearing throughout the ship, involving the crew in a clash between two alien races. One of them is dumping toxic waste in the other's space, slowly killing all of the inhabitants.
There's a sudden emergence of a dangerous new lifeform aboard the USS Voyager - a Superborg - after The Doctor's 29th century mobile emitter technology mysteriously fuses with Seven of Nine's Borg nanoprobes.
- Extreme Risk
Torres' crewmates are alarmed when she repeatedly engages in reckless activity including orbital skydiving. Meanwhile, after the USS Voyager directs its probe into a hazardous atmosphere, protecting it from a Malon freighter, Lt. Paris launches a newly constructed, all environment shuttlecraft, to retrieve it.
- In The Flesh
USS Voyager discovers that Species 8472 has constructed a simulation of Starfleet headquarters in San Francisco so they can practice posing as humans in their first step of an invasion of Earth.
- Once Upon A Time
As the USS Voyager searches for the Delta Flyer and its crew, Lt. Paris, Commander Tuvok, and Ensign Wildman whom have crash landed on the planet and "buried alive" in the surface, Neelix helps Naomi Wildman, Ensign Wildman's daughter, cope through the missing of her mother. And a way Neelix helps her is by showing her her favorite holonovel.
Using slipstream technology to reach Earth, the crew's "icy fate" leads to the death of the entire crew. Only Chakotay and Kim can save the lives of the crew by sending a message back in time, to stop the slipstream warp before it's too late.
- Infinite Regress
Mysteriously, the USS Voyager comes upon a floating Borg Vinculum - a device that interconnects Drone's minds aboard a Borg vessel - which swiftly causes Seven of Nine to manifest ersonalities other than her own including that of a Klingon warrior, a Ferengi, and a six-year-old human girl. Janeway is crushed to learn that before Tuvok, The Doctor and she can intervene, Seven may be completely lost.
- Nothing Human
After Torres is stricken by a bizarre, injured alien that latches itself onto her body, The Doctor creates another holographic physician, a Cardassian exobiologist named Dr. Crell Moset, to save her life. But Torres refuses treatment when it's learned that the physician engaged in unethical wartime medical practices.
- Thirty days
The USS Voyager makes a fascinating discovery, a massive ocean floating in space and populated by the Moneans, a maritime alien species. When Janeway learns that the Monean's deep sea home is losing containment, she offers Starfleet technological assistance, a modified, now seaworthy Delta Flyer piloted by an eager Lieutentant Tom Paris. But soon after Paris and Riga, one of the young Monean scientists, return from their deep sea exploration, Paris is accused of a stunning breach of protocol - with dire consequences.
As the USS Voyager rescues two families of telepathic alien refugees from the Devore Imperium, they are intercepted by a Devore squadron and boarded by inspectors searching for the defectors. Soon Kashyk, the lead Devore officer pleads with Janeway to grant him asylum.
- Latent Image
While employing his holo-imaging device, The Doctor discovers that his short term memory buffer has been tampered with and fervently initiates an investigation to find the person or thing responsible for the corruption.
- Bride of Chaotica
Armed conflict erupts when aliens from the Fifth Dimension mistake Lieutenant Paris' "Captain Proton" holographic novel for reality. The aliens consider the novel's main character, the evil Doctor Chaotica, to be a threat so they knock Voyager's controls off-line. Janeway is forced to assume the role of the story's powerful Arachnia, Queen of the Spider People, and infiltrate Chaotica's Fortress of Doom. Meanwhile, The Doctor takes on the role of the novel's President of Earth to help the aliens defeat Chaotica.
A shuttle carrying Tuvok, Paris and The Doctor disappears into a collapsing sinkhole and crash lands on a deserted wasteland. While Voyager tries to rescue them from this risky area of space, the Away Team befriends Noss, an exotic alien woman who's also trapped on the planet. Soon, she falls in love with Tuvok and although it's illogical for a Vulcan, he finds himself attracted to her too.
Finally, after five long years, an exhilarated crew of the USS Voyager finds a wormhole that will bring them back to the Alpha Quadrant. As the happy crew prepares to return to Earth, a skeptical Seven of Nine violates captain's orders and enlists The Doctor, little Naomi Wildman and an alien pilot, Qatai, to help her stop the ship from entering the wormhole.
- Dark Frontier, Part 1
The crew of the USS Voyager successfully defeats a vessel of its most powerful enemy, the Borg. After they examine the debris, Captain Janeway launches an ambitious, high risk mission to invade another Borg sphere and steal Borg technology. But the Captain may have underestimated the Borg, which quickly detects her plan, swiftly accesses Seven's neutral transceiver and makes an "offer" she cannot refuse - rejoin the Borg hive and Voyager will be spared destruction.
- Dark Frontier, Part 2
Captain Janeway, mystified at Seven's apparent betrayal prepares an away team for a daring rescue. The rescue attempt leads to a vicious showdown with the Borg Queen!
- The Disease
Without Starfleet medical clearance and in violation of interspecies protocol, Ensign Harry Kim has a passionate love affair with an exotic alien explorer, Derran Tal of the Varro species. But the escapade puts both the Voyager crew and the Varro species in Jeopardy when Kim and Tal become biochemically interdependent.
- Course: Oblivion
Lieutenants Tom Paris and B'Elanna Torres tie the knot but their holographic honeymoon is cut short by a phenomenon that breaks down the USS Voyager's infrastructure and disintegrates not only the ship but the crew.
The ship and crew aren't really the USS Voyager crew, but the life-form from the Demon planet that have replicated Voyager and also embarked on their way to Earth. .
- The Fight
When the ship is caught in chaotic space, a zone in which the laws of physics are in a state of flux, Commander Chakotay believes he's a 24th century boxer, The Maquis Mauler. Before long, he's going head to head with the Delta Quadrant champion, Kid Chaos.
- Think Tank
In the midst of a clash with the Hazari bounty hunters, Janeway is offered assistance from a "think tank," a small yet exotic alien ship containing disparate life forms, each able to communicate telepathically. Their spokesperson, Kurros, offers to help solve the dilemma with the Hazari, only in exchange for Seven of Nine
as payment. When Seven declines their "offer," the think tank focuses on taking her by force.
The USS Voyager rescues two crewmen from an abandoned, out of control Malon freighter that's about to unleash a theta radiation blast into the sector. Soon, Lieutenant Torres leads an away team to board the freighter and contain the poison despite warnings from its crewman, Fesek and Pelk, about the Angel of Decay that wreaks havoc aboard the cargo ship.
- Someone To Watch Over Me
To broaden her knowledge of human behavior, Seven of Nine gets lessons from The Doctor on socializing and dating rituals. When they enter a holodeck simulation in Sandrine's nightclub, Seven not only learns the art of small talk, but how to slow dance and sing a song. Eventually, she makes a date with Lieutenant Lansing but it's The Doctor who falls in love with Seven. Meanwhile, during a tour to help facilitate a trade agreement with the monastic Kadi colony, Neelix unwittingly provides their ambassador, Tomin, with forbidden food and drink.
Captain Janeway reminisces about her ancestor Shannon O'Donnel, the first of her family's long line of explorers and one who helped build the Millennium Gate on Earth. As Janeway relates the story, the episode revisits the town of Portage Creek, Indiana on New Year's Eve 1999, as Shannon O'Donnel (played by Kate Mulgrew) nears the deadline to convince the town's last holdout, local bookstore owner Henry Janeway, to approve the building of massive, half a mile high Millennium Gate, a model for the first colony on Mars.
In an episode that revisits Janeway's first day aboard the USS Voyager and then fast forwards 500 years beyond it when her ship is destroyed, Captain Braxton of the 29th century Federation Timeship Relativity contacts Seven of Nine to go back in time to solve the mystery of who planted the temporal disrupter which ultimately destroyed the USS Voyager. But when the new starship captain, Janeway, catches the mysterious Seven aboard the brand new USS Voyager, she detains her, an interference that could contaminate the time-line.
After the USS Voyager receives a distress signal from an alien missile, Ensign Kim, Torres and The Doctor determine that it's a complex, damaged weapon with artificial intelligence and sentient consciousness. But when they beam this mysterious device aboard, it interlinks with The Doctor's program and through him, insists the USS Voyager enable it to fulfill its mission of mass destruction.
- Equinox, Part 1
The USS Voyager finds another Federation starship lost in the Delta Quadrant, the science vessel USS Equinox, and helps it stave off an attack by creatures from another spatial realm. Captain Janeway now has a kindred spirit in its commander, Captain Rudy Ransom, and helps him salvage his war-torn vessel so they can journey home together. But when The Doctor retrieves data from the USS Equinox research lab, Janeway learns the hard truth that Captain Rudy Ransom has seriously violated the Starfleet oath by commiting mass murder in the Delta Quadrant. When she strips him of his command and confines him to quarters, he and his crew manage to escape with the USS Voyager's advanced technology--and The Doctor and Seven of Nine as hostages aboard their ship.
This episode was the last of the 5th season and a cliffhanger.