Once again Noviandra switches places with her sister (after some notable incompetence on Juliandra's part), allowing her to trick Biff into flying her and a trussed-up Rocky and Prof Mayberry back to Regalio where she tries to trick the Nizam into an alliance. At this point the story takes a strange turn: the evil sister, who has been long locked away in a dungeon on Herculon, begins to empathise with the Regalion robot, who is imprisoned in the magnetic field control room. This is a fun episode of the venerable space-opera, whose swan song was the next 3-parter - the uninspired 'Trial of Rocky Jones', and yes, in the end Rocky seems to have forgotten where the Silver Moon was parked. The triptych arc was combined and rebranded as the film "Robot of Regalio".