While the unsuspecting citizens of North Col are preparing for their journey to Haven, the Shadowmaster is assuring Tao that a labour force will arrive soon to help in the mining of the Thunderstone. Becky's suspicions are aroused when she sees Dr. Pretorius behaving strangely. As she explores a deserted North Col she discovers that Dr. Pretorius has the missing vaccine in his secret lab. Captured by the Shadowmaster she is forced to join the others in Haven. Noah unmasks the Shadowmaster revealing him to be Dr. Pretorius. Noah is not the evil Shadowmaster. Forced by Dr. Pretorius to listen to his great vision of a new Haven, they arrive at Tao's base camp just as the recaptured Nomads are herded in. An argument erupts between Tao and Pretorius and to prove his authority Dr. Pretorius exiles the Nomads… through time into the snowy blizzard of North Col. (thetvdb.com)