Lambert's company, like Hammond's, is on a list of firms competing for the European rights to Japanese businessman Mr Tusamo's new circuit elements that will replace the transistor.

After Steed explains his interest in computers, Armstrong's sidekick Benson contacts the scientist via two-way videophone and mentions that someone replaced Lambert at Tusamo's office.

Armstrong gives Steed a parting gift: a gadget pen containing solid ink which liquefies only in the heat of the hand, thus reducing the danger of leaks.

Steed and Mrs Peel visit the toy factory and discover that Jephcott has been killed by something with the force of a ten-ton truck, leaving a hole in the wall in the shape of a tall man.

Steed revisits United Automation, this time covertly, and discovers that Armstrong has been using a robot Cybernaut named Roger to kill off his rivals for the Tusamo concession.

The Cybernaut is programmed via computer to home in on a radio transmitter concealed in the gadget pen given to Steed – the same method used to kill Hammond, Lambert and Jephcott.

[5] Jeffrey S. Miller described the episode as "a tale of industrial intrigue, with several business executives being violently dispatched by someone of apparently superhuman strength.

"[7] The 1998 film The Avengers pays homage to the episode with Uma Thurman playing Dr Peel, a jujitsu expert and specialist in meteorology, "battling a clone duplicate of herself.