The concluding six-part segment of the "Key to Time" storyline can be considered two separate narratives. Initially, the Doctor (Tom Baker) and Romana (Mary Tamm) land on “Atrios,” finding themselves in the midst of a conflict with “Zeos.” The war had reached an impasse until then, but the “Marshal” (John Woodvine) believed he possessed a strategy that could change everything, despite Princess "Astra's" (Lalla Ward) …