Plot hole: The atmosphere of the Class Y "Demon" planet is repeatedly said to be highly corrosive and unable to support life. It isn't even safe for Voyager to stay in orbit for very long and Paris and Kim's spacesuits begin to fail after a while of being on planet. However, their shuttle, having been landed on the planet for several hours by the time Chakotay and Seven find it, shows no sign of damage. Even the leather upholstery of the seats or carpet interior (the rear hatch having been left open) isn't dirty. If Starfleet has built its starships and spacesuits out of that same upholstery, this mission would have been no problem.
Star Trek: Voyager (1995)
1 plot hole in season 4 - chronological order
Deliberate mistake: When the Doctor begins to "fade" in the transporter room his mobile emitter fades with him. Since it's made of solid matter and is not a hologram, this shouldn't be possible.
The Doctor: Watch your tongue... Or I'll remove it.
Trivia: Rain Robinson has a model of a DY-100 on the window sill in her office. In 1996 (also the year this episode is set), Kahn left Earth in the SS Botany Bay, a DY-100 class starship.
Question: How did Magnus and Erin Hansen know about the Borg?
Answer: Add to that, the two transport ships at the start of Star Trek: Generations were carrying El-Aurian refugees to Earth. It wasn't stated in the film what they were refugees of, but Guinan would state in TNG that the Borg wiped out her planet and most of her people, so it's a safe bet that's what it was. And with 47 El-Aurians being rescued by the Enterprise-B, there were plenty of people to tell Starfleet about this cybernetic threat. At the time though, Starfleet did not have the ability or resources to investigate this further, and it was eventually forgotten when other things became important until the Enterprise-D encountered that cube at J-25.
Answer: Keep in mind in Star Trek: First Contact; it's known the Borg were present during the first flight. It's also brought up again on Star Trek: Enterprise Season 2 Episode 23, Regeneration. Archer talks about how Zefram Cochrane mentions cybernetic aliens from the future were trying to attack the settlement and how another group of human beings from the future destroyed them.
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Chosen answer: Before Q sent the Enterprise to the beta quadrant to officially contact the Borg, there were already indications that the Borg was beginning to reach Federation territory. There were remarks towards the end of the first season of the Next Generation that several of the furthest Federation outposts were being attacked by some unknown enemy. They suspected the Romulans, but when contact with the Romulans was re-established, they learned that it was not them. The Hansens had simply figured things out much earlier than anyone else in the Federation. They learned about the Borg nine years earlier, but Starfleet mainly took notice when their outposts started getting wiped out. It is logical to assume that there were indications of Borg scouting parties and research efforts well before that.
Garlonuss ★