WRAITH
A vampirous, hive-based species that harvest on the life-force of other beings for nourishment through suckers on their palms. Countless worlds in the Pegasus Galaxy live in constant fear of the Wraith, who return periodically to cull their human herds. The Ancients first encountered the Wraith many thousands of years ago. At that time, the Ancients had established a vast network of Stargates with thousands of worlds in the Pegasus Galaxy, which they seeded with human life. They had never before encountered a race with technology that rivaled their own, until they met the Wraith.Once awoken, the Wraith fed upon the people on these worlds -- until the city of Atlantis was all that remained untouched. The Wraith attacked Atlantis with their powerful weapons, but the Ancients' shield held. Defeated, the Ancients decided to submerge the city and leave through the Stargate to Earth.The Wraith have a frighteningly efficient regenerative mechanism in their genetic makeup, allowing their bodies to heal themselves. Even bullet holes quickly seal themselves like evaporating water. Their regenerative abilities are so powerful that it is unlikely that the Wraith ever die from natural causes the way that humans do. The species also has advanced telepathic abilities: they can force their prey to see things that are not there, and can use their mental powers to forcefully interrogate humans.The Keeper drains the life from Colonel Sumner. From "Rising, Part 2" 
The Wraith as a collective species go through long hibernation cycles, sometimes lasting centuries. Their massive hive ships contain untold numbers of hibernation pods. During this time only a small number of them move about, enough to keep their victim worlds on edge. The sleeping masses are watched over by the Keeper, one Wraith designated with their care whose death would signal their premature awakening -- as it did when she was killed by Major John Sheppard.
The Keeper interrogated Colonel Marshall Sumner and learned that a plentiful feeding ground -- Earth -- exists elsewhere in the universe, but she was unable to determine where. Upon her death, the entire hive reawakened. Now that the species is moving, feeding on planets throughout the Pegasus Galaxy, no one is safe.
The Wraith use stun weapons to incapacitate their prey, so that they can feed on their victims later. Their ships include the hive ships, which can land on planets during an extended hibernation cycle, and Wraith Darts -- small, fast-moving ships capable of travelling through Stargates and equipped with culling beams for transporting their prey aboard.Wraith hive ships are governed by Queens who direct that specific vessel's mission. The Queens have a brittle relationship with one another, but regularly put this distrust aside to join forces and increase their success in a culling.

REPLICATORS:Technologically advanced "bugs," Replicators are programmed by the creators with only one objective: self replication. Anything and everything that interferes with this plan of infestation, annihilation and duplication is immediately at risk.The world where the Replicators originated is actually in our own Milky Way galaxy. A corrupt and childlike android, Reese, created the Replicators to be her "toys," but also capable of defending her from threats. As their creator, she also passed on to them her own design flaw. As the inhabitants of her world feared the toys, and tried to destroy them, she ordered them to "replicate at all costs." She quickly lost control, and the Replicators annihilated her civilization, and her own creator in the process. After the Replicators left, Reese went into a deep depression and deactivated herself.Replicators are composed of hundreds of individual blocks, which are comprised of whatever substance the original Replicator has consumed. It is unclear how many blocks make up a standard Replicator, but two Replicators are required to make a third, and thus exponential growth. It takes only a few blocks to replicate new blocks, and in a few hours Replicators can breed from a handful into hundreds.There are different kinds of Replicators, depending on what the creatures require to achieve their goals. The most common is the "spider" Replicator, with four legs and wing-like flippers on its dorsal side. Another Replicator is much larger and insect-like, appearing in the general shape of a giant fly.

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