Ambassador Timus Irnok Mosta visits the Tomorrow People in their Lab, and asks for their help. He takes John and Elizabeth to the Great Pyramid of Chaeops in Egypt, and tells them that the pyramids were built by the alien Kulthan. Hidden behind a secret panel is a Psi-Damping transmitter, used to prevent telepathic abilities operating on Earth. Timus asks the Tomorrow People to travel the planet Peeri, to deactivate the Psi Damping Transmitter there, and to persuade the Kulthan to leave. Unlike standard Galactic Agents, the Tomorrow People are not reliant on their telepathic powers, and are perfect for the mission. Arriving on Peerri, John, Stephen, Elizabeth and Tyso set up base in a cave used by Tikno, one of Mosta�s clone brothers. They rescue a girl, Lenda, from a hunt, but Tyso gets his foot stuck in a man-trap, and some hunters approach.