Bölüm Adı: Journey to Xilbalba - Yayın Tarihi: 28 Tem. 2013
Konu (Dikkat Sporiler içerebilir!)
Tom uncovers confidential intelligence about the heart of the alien operation. Meanwhile, Charleston prepares to mount an offensive against the Espheni, but a massive explosion brings the operation to a halt. And the identity of the mole is finally uncovered, but not before more blood has been shed.