When a Titanian scientist goes missing, Firewall activates a team of Sentinels to investigate. In this episode, they travel to the Pohl Research Station on Pandora, where the subject of their inquiry worked as a xenobiologist. As the team learns more about his work before he disappeared and the company he kept in his off hours, the likelihood that some deadly ex-risk is involved looms large, but what is it and how can they put a stop to it? Listen to find out!