Thenora was a planet in the Pegasus galaxy that was home to a race of Humans.

Sometime in 2005, the planet was attacked by the Wraith and the planet's inhabitants were culled, possibly leaving no survivors. The First Atlantis Reconnaissance Team and another team were investigating the planet, searching for any survivors. They failed to find any, and were about to head back to Atlantis, when they encountered a Wraith Dart. The teams managed to shoot it down before it was able to alert the Wraith to their presence, however it had already transported Lt. Laura Cadman and Dr. Meredith Rodney McKay into its buffer. Fortunately, the remaining team members were able to retrieve the relatively undamaged Wraith transporter from the wreckage and bring it back to Atlantis to attempt to restore them.(SGA: "Duet")

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