- Composed of hundreds of individual blocks that link together
- Usually took the form of bugs but could assume many forms
- Could evolve to form human-form Replicators
- Consumed resources, used the raw materials to build more of themselves
- Seek out the most advanced technology, & incorporated it into their own being
- Created by an android called Reese, began self-replicating
- Seized control of Asgard vessels & advanced toward the Othala
- Trapped within a time dilation field by the Asgard
- Created a Human-form Replicator, managed to escape the field
- The Tau'ri & their allies fired a Replicator disruptor wave through a modified Stargate;
- It dialed every planet in the galaxy & disintegrated all Replicators
