“Tracker” is episode nine of season five of Stargate: Atlantis.
Rodney has volunteered to accompany Dr. Keller – on his day off – on a goodwill mission as she is visiting a planet to help the sick inhabitants. He is hoping to endear himself to her, so he’s a bit narked when Ronon comes along as well.
Dr. Keller is kidnapped from the settlement by someone who turns out to be a runner, just like Ronon used to be – someone who is implanted with a tracking device by the Wraith, who then hunt the tracked victim down for sport. McKay and Ronon start to report her as being missing, when some Wraith come through the planet’s stargate after the runner. The runner has an interesting piece of teleportation technology. Ronon and McKay start tracking them, bickering as usual.