"This should be interesting."
Teyla Emmagan[src]

The Sions were a race of Humans native to the Pegasus galaxy. Their homeworld was M9R-373. Teyla Emmagan possibly had dealings with them in the past, as she is familiar to the planet designation. Their world was targeted by the Asurans to wipe out the Wraith's food supply. The Atlantis Expedition tried to evacuate their homeworld, but the Asurans still managed to kill ca. 2,000 Sions, as well as Lieutenant Kemp and his team. (SGA: "Be All My Sins Remember'd")

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