Stargate Atlantis - Series 4: Vol. 5

Season 4: Episodes 17-20
Midway:
Teal’c’s attempts to calm Ronon during a critical IOA interview fail. But far more threatening than Ronon’s temper is a Wraith plan to attack the Midway station.
The Kindred:
As Teyla and Sheppard search for signs that Kanaan is still alive, a mysterious illness is traced to a human-engineered protein found in the Wraith’s food supply.
The Kindred, Part II:
A friend once believed dead returns to Atlantis. Meanwhile, Teyla, now captive herself, plots an escape for fellow Athosians who are interned at a secret facility.
The Last Man:
Unable to locate Teyla, Sheppard heads back to Atlantis, only to discover that the city is suddenly missing something – its inhabitants!