Steed has invented a way of using a triumvirate of agents with photographic memories to memorize top secret information in three parts. Each third being useless without the other two. A brilliant criminal named Juventor plans to use a mind-swapping device to piece all three parts together and sell the combined information to the highest bidder. When he learns The New Avengers are closing in on him, Juventor decides to swap brains completely with one of his victims.
—The TV Archaeologist