Stephen is caught in a time trap. While John attempts to make another Time Disc, Stephen meets a Guardian of Time called Zenon, Peter's grandfather. He frees Stephen and warns him not to build another Time Disc, as its user could be lost in eternity; Peter is trapped in Roman times, and Zenon gives Stephen five Time Discs so that the Tomorrow People can try to rescue him. Stephen arrives in the Lab just in time to stop John using his new Time Disc. Later, Professor Garner tells them that the vase came from a gladiator school in Silchester, run by a ruthless man named Gaius. John, Stephen, Elizabeth and Chris use the Discs return to ancient Roman Britain. They �sell� Stephen to the gladiator school, but then discover that their telepathic abilities have disappeared. Stephen is locked in a dungeon with Peter, who thinks that someone is transmitting a telepathy-inhibiting radiation. After Gaius selects Stephen to be tested by fighting, John, Elizabeth and Chris try to buy him back, but Ga