68Hold the Ridge (Part 4 - Secrets of the Earth)
69Overrun (Part 4 - Secrets of the Earth)
70Countdown to Zero (Part 4 - Secrets of the Earth)
71Planned Obsolescence (Part 4 - Secrets of the Earth)
72Colossal (Part 4 - Secrets of the Earth)
73Threat Assessment (Part 4 - Secrets of the Earth)
74Will Against Will (Part 4 - Secrets of the Earth)
75Drawn To Strife (Part 4 - Secrets of the Earth)
76Little Ones (Part 4 - Secrets of the Earth)
77Beasts of Steel (Part 4 - Secrets of the Earth)
78Drums in The Sun-Ring (Part 4 - Secrets of the Earth)
79Death and Rebirth (Part 4 - Secrets of the Earth)
80A Storm in the West (Part 4 - Secrets of the Earth)
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