10 Scariest Stargate Episodes Ever

10. Stargate Season 4 Episode 1: Small Victories

The first season of season four of Stargate involves a follow-up to the previous season finale, which saw the supposed defeat of the near-unstoppable ever replicating mechanical army called the Replicators.

The Replicators are basically magnetic LEGO bricks gone horrifically wrong, and not only lead to the destruction of the Ancients, but also the technologically advanced Asgardians. A single piece of a Replicator that survived the destruction of Thor's ship (yes, THAT Thor) has found its way into a Russian submarine.

The Replicator then began doing what it does best and tore the ship apart, creating a whole generation of unstoppable killing machines made of submarine parts.

Though the episode mostly consists of sci-fi space battles between CGI armies, the scenes with the Replicators killing their human victims in horrific fashion can be quite terrifying. Especially since the Replicators have a constant, iconic clanging sound they make when they march towards their foe, which only gets more terrifying the louder it gets.

Mix that with the screams of defenseless humans and you have yet another great sign not to truly trust Siri with all the details about your life.