With the Viperox invasion in full force, the Doctor needs the help of Rivesh Mantilax to activate the genetic device.
While the Doctor and Saruba try to save the life of Rivesh, Cassie and Jimmy search for the TARDIS in the midst of a Viperox invasion.
Colonel Stark and Lord Azlok reveal their secret behind the alliance between the U.S. Army and the Viperox.
The Doctor meets Jimmy's grandfather, Night Eagle, and discovers the true story about the Gray aliens.
The Doctor, Cassie and Jimmy escape to Solitude where the mystery of the Viperox is revealed.