In Syrtis Major's corridors of power, a threat to the British Empire's dominion over Mars is close to discovery, and Governor-General Sir Henry Routledge faces ruin if it ever comes to light. In the wilderness of the Thoth Steppes, enemy powers, savage tribesmen and even nature herself bar the way to the wreckage of a lost Ether Flyer, and the secrets it hides. For Captain Roger St. John Ffolkes, it is a mission he cannot refuse; for the adventuress Georgina Golightly, a journey that will risk all - and for Mars, it is the chance to save a world...or ignite a war. Everything Jules Verne should have written. Everything H.G. Wells could have written. Everything Arthur Conan Doyle thought of, but never published - because it was too fantastic. Directed by John Ainsworth Starring Simon Williams (Captain Roger St. John-Ffolkes), Ivor Danvers (Sir Henry Routledge), Ian Brooker (Professor Golightly), Jo Castleton (Miss Georgina Golightly), Sam Peter Jackson (Hauptmann Werner Lenz), Toby Longworth (Sergeant Horace Carstairs), Jon Weinberg (Mr. Lucas Tyler), Tam Williams (Prince Skerrun), Robert Curbishley (Captain Archer), Christopher Fletcher (King Daryoon), Katarina Olsson (Miss Charlotte Wong), & Philip Madoc (General Karl Heinz Hagen)

Her Majesty's Ship, The Indomitable, is sent to investigate the mysterious disappearance of Doctor Cyrus Grant whilst journeying to Earth's dead satellite. The crew soon discover that Luna is not so lifeless after all... An alien weapon manned by enemies of the Empire; strange creatures hiding in the lunar catacombs; a lost civilisation with technology beyond the wit of Earth. Captain Nathaniel Blake and lunar expert, William Brooker, must brave all these and more to rescue the missing scientist and his niece. New friends and old enemies play their parts as the two men uncover exactly what the lunar inheritance means to the future of the British Empire, and even Earth itself...