- The Avengers investigate a series of murders of Corporate men, who have all been bidding on a new circuit element. Each one of them seems to have been killed by a powerful Karate blow, so Mrs. Peel visits a Karate Dojo, Steed's inquiries lead him to United Automation, where ex-Ministry scientist Dr. Armstrong is working on an electronic brain, not to mention cybernetic men.—The TV Archaeologist
- Businessmen keep turning up dead. Eyewitnesses agree the perpetrator is between 6'2 and 6'6", perhaps with glasses, but that is it. Except for the mysterious whooshing sound that accompanies the murders. And they all died of skull fractures or broken necks. The case takes Mrs. Peel to a karate dojo, and Steed to several electronics companies. One of them, a doctor with grandiose dreams of miniature computers and artificial intelligence, gives him a space-age pen, with solid ink that needs no refills for 10 years. Little does he know that the pen ALSO contains a homing device that leads the assassin, finally shown as an robot, directly to the pen's location. Later, while stuck in an air-conditioning duct, Steed overhears the doctor talking about the pen's true purpose and tries but fails to warn Mrs. Peel, who is idly doing a crossword puzzle with said pen, waiting for Steed's return. The bad guys watch a monitor as the cybernetic killer approaches the pen's location, which is in Mrs. Peel's pocket as she paces, worrying about Steed. The killer breaks in... but the pen is gone, along with Mrs. Peel who is on her way to find Steed. She arrives to find Steed on the run inside the villain's complex but just about cornered by another cybernaut, and this one does NOT need a pen to find its quarry because it has a brain. Mrs. Peel bursts in with her cybernetic assassin in close pursuit. Thinking quickly, Steed tells Mrs. Peel to give him the pen, and he puts it in the brainy robot's coat, causing the two cybernetic men to begin wailing away at each other. The doctor watches, horrified, while pressing buttons to make them stop. But, he comes too close and gets whacked himself, just before the homing robot destroys the brainy one, as well as the homing device itself. Its mission complete, it stops completely, so that Mrs. Peel is able to push the robot over with one finger. In the denouement, Steed asks Mrs. Peel to help him with a crossword. The answer she suggests is 'cybernaut'. When Steed's pencil breaks and Mrs. Peel offers him a pen, he says he doesn't use those 'newfangled things'.
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