Failing to overpower Kaagh as he implements his plan, Sarah Jane, Luke, Clyde and Maria are saved by the arrival of Alan and Chrissie, the latter discovering the truth about Sarah Jane's alien investigations. Chrissie knocks Kaagh unconscious by jamming the high-heel of her shoe into the probic vent on the back of his neck, but an electrical charge also knocks her out and Alan and Maria think they can pass the day's events off to her as a dream. Luke is able to deactivate the computer Kaagh has rigged to ground the satellites and with his ship's weapons deactivated, Kaagh is sent back to his home planet, Sontar.
Six weeks later, Alan and Maria leave for America. Chrissie reveals to Sarah Jane that she remembers everything about the Sontaran incident.
