Zeos's automated systems and their deceptive control over organic life forms

Romana and Merak establish a tense standoff over Astra’s abandoned bangle, while the Doctor and Shapp navigate the eerily deserted Zeos corridors accompanied by K9. Observations about the planet’s dusty, …

Shapp arrives to confront the Doctor but discovers his enemy is not a massive army as he assumed but an impersonal automated system named Mentalis that controls all of Zeos. …