The Scourge

The Ori have engineered a bioweapon of bugs (known as R-75 or "Prior bugs"), asexual, fast-reproducing, omnivorous insects. When given meat, its numbers increase dramatically and they become voracious swarming predators, able to strip a human to the bone in moments. They prefer darkness and spend most of their time underground, where they hunt via echolocation. When a group of Earth diplomats go on a tour on the off-world Gamma Site research base, R-75 overrun the base and consume most of the base personnel. Cut off from the Stargate, SG-1 is forced to flee to a research site and set up a message to alert the Odyssey to rescue them when it arrives. The Odyssey rescues SG-1 and the delegates and destroys the bugs with a toxin, but the bugs are spreading on other planets and are revealed to be another tactic of the Priors.