Plot summary
The team comes to the aid of a village under Wraith threat, but Ronon and McKay must rescue one of their own when Dr. Keller is kidnapped by another Runner, like Ronon, named Kiryk, who has brought Wraith hunters to the planet. Ronon is forced to act as a Runner so he can save Dr. Keller from Kiryk. It is eventually revealed that Keller was kidnapped only because her help was needed to treat an injured little girl traveling with Kiryk as he couldn't risk her refusing to help. Keller treats the girl and having earned Kiryk's trust, disables his tracking device before they are reunited with Ronon and McKay.
The group defeats a Wraith attack, but finds the Stargate guarded by a group of Wraith and two Darts. Kiryk lures the Wraith through the Stargate to another planet and his fate is unknown, but his sacrifice allows the group to return to Atlantis where the girl recovers and is adopted by a family on the planet where Keller was kidnapped as her own planet was destroyed.
Credits
Adapted from Wikipedia contributors, Stargate Atlantis season 5. HTML formatting and reference markers removed.