10 Times Streaming Era Star Trek Went Apocalyptic
1. The Loom Threaten To Erase Existance - Ouroboros Part 2
The Loom are one of the more frightening villains that Star Trek has introduced. They feed on the paradoxes created by temporal changes, breaking through weakened points of reality. In Star Trek: Prodigy, they arrive in the Prime timeline to promptly feed on their victims, erasing all evidence of them from history.
That is perhaps the scariest aspect of the Loom. They don't simply kill you. They make it so that you were never alive and that no one has any memory of you, organic or digital. Such is the case with poor Ensign Middleton, along with who knows how many others.
Though they can be killed, it is no easy feat. Phasers have to be tuned to their phase frequency, while shields and barriers have little impact on them. While Ascencia was able to capture one, the exact how of that is in doubt, and she didn't keep it captive for long.
By Ouroboros Part 2, an army of Loom threatens to wipe out all of history unless the Protostar is sent back to its resting place on Tars Lamora. The combined efforts of the Protostar's crew, along with Captain Chakotay, the Voyager-A, and Wesley Crusher, manage to slip the ship past the swarm and send it to its final destination.
This doesn't defeat the Loom, though. Rather, with the changes in the timeline fixed, they lose interest and leave. Such is the true nightmare that they represent: they will come for you when they feel like it, and there is very little you can do about it.