Doctor's growing dread as he realizes the true nature of the alien hand's threat to humanity, forcing him to set aside his detachment and take decisive action

The quarry detonation sends debris crashing down, trapping Sarah Jane beneath rubble. As rescuers free her, she awakens in pain and reaches out to grasp a broken alien hand embedded …

The Doctor and pathologist Carter scrutinize X-ray images of the alien hand in a pathology lab, revealing its silicon-based crystalline structure. Carter’s initial skepticism gives way to fascination as they …