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|Out of universe information|
M4X-337 was a barren planet in the Pegasus galaxy which held a Stargate and was explored in the early days of the Atlantis expedition. When a shadow creature escaped its confinement on Atlantis, Dr. Rodney McKay managed to bait it through the Stargate to M4X-337 by throwing a Naquadah generator through. (SGA: "Hide and Seek")