Military team (Scott/Snyder) vs. extraterrestrial android threat

Lieutenant Scott’s team conducts a scanning sweep at an active fossil quarry when Walters detects multiple anomalous lifeform readings. The anomaly escalates when Walters identifies an ectopic heartbeat signature in …

As Tegan and Nyssa clear rubble to reveal a hidden hatch in the cavern wall, Scott orders the Doctor’s group to open it. Despite the Doctor’s protests, Nyssa complies and …