10 Doctor Who Villains You're Surprised Only Appeared Once
7. The Axons
The Jon Pertwee serial 'The Claws of Axos' is a bit of an underrated classic. It's the first story by Bob Baker and Dave Martin, who would go on to co-create K-9, and tackles some very timely concerns around energy. With the world facing an energy crisis, alien visitors land in the English Home Counties (Where else?) to offer clean, renewable energy to humanity.
Of course, their gift comes at a price and soon the Doctor has to team up with the Master to avert their dastardly plans, trapping them inside a time loop. The Axons are still stuck in that time loop on-screen, though they've occasionally escaped to wreak havoc in two Big Finish audios, the second of which is to be released later this year.
As humanity continues to discuss the financial and environmental costs of fuel, surely the Axons are primed for a comeback. It would surely be a foolish endeavour for the Axons to try the same grift twice, but humanity's never been great at learning from their history. It would take the Doctor to pop in and save us from our own errors once more. They're an incredibly striking looking creation though, sort of psychedelic golden gods. Their true form, all orange tendrils would later be repainted to become Krynoids, but more on those later.