Sarah Jane Smith’s personal battle to survive and resist Zygon control after being exposed to biometric seizure and psychological manipulation

Trapped in the pressurized decompression chamber, Sarah experiences the first brutal effect of the Zygons' nerve agent assault. Her airway constricts as the oxygen levels plummet, cracking the door open …

Sarah investigates the commotion in the barn, climbing to the hayloft to find Harry only to discover the Zygon replica. The duplicate attacks with a pitchfork, desperate to eliminate her …