10 Most Overrated Star Trek Villains
9. Swarm
A dangerous new foe shows up on the scene in Voyager's third season, probably hoping to take the "recurring villain" spot vacated by the fleeing Kazon only a few episodes before.
Mysterious and deadly, they were only ever identified as the Swarm but featured in early season three promotional materials for Voyager and were presented as the next thing for the crew to worry about.
Undefeated at the climax of their eponymous episode, the lack of finality indicated that they would be back and in greater numbers. Nothing is really learned of them and it's more of a standoff than a cessation of intent. Much of the weight of the Swarm comes from the ominous description of this new foe and the indication of the danger Voyager faces by traversing their space. While the Vaadwaur would later benefit from similar single episodic build-up, the Swarm are almost blink-and-miss leaving them defanged in minutes.
It's not as if Voyager had another Big Bad on the horizon that was mysterious, deadly and acted as through there was some form of hive mind - a collective if you will. If only they dressed all in black as well...