Arriving in Australia in the near future, the travellers meet Giles Kent, and discover that the Doctor is the physical double of the globally famous Mexican politician, Ramon Salamander. Most of the world regards Salamander as a philanthropic hero - he has devised a means of storing and supplying solar energy, thereby ending famine, and preventing natural disasters is his next aim.
Kent however, believes that Salamander is a would-be dictator, and the Doctor uncovers the truth by impersonating his doppelganger. Gaining access to Salamander's base, the Doctor finds a bunker where scientists have been undergoing an endurance test for the past 5 years (a concept reworked for Invasion of the Dinosaurs).
Salamander had convinced his team that a war had broken out on the surface, and had them engineer the apparent natural disasters against their unseen enemy. Kent is exposed as a traitor and destroys the station. Salamander then tries to escape in the TARDIS by pretending to be the Doctor, but is ejected into the vortex.
Written by David Whitaker, this story is a break from the popular monsters and 'bases-under-siege' format of season 5. This 6 part serial is considered the weakest link of the season, with a markedly different style, and it's obvious lack of monsters, but the highlight is Patrick Troughton's dual role.
This political thriller is the closest the show ever got to the James Bond films (and could even be compared to The Avengers). The action spans continents, features glamorous girls, and sees a villain, complete with underground base, intent on ruling the world (footage of an exploding helicopter is courtesy of From Russia With Love).
The Radio Times sets the adventure in the year 2017
Screened in 1967/68, only 3 episodes exist, and was released on The Troughton Years video. Fraser Hines provides the linking narration on the CD version. The story was placed at No. 139 in the DWM Mighty 200 Poll (Issue 413, September 2009).