The Invasion (Doctor Who)

Notes

• Working titles for this story included Return of the Cybermen.
• The character of Tobias Vaughan reappears in the Virgin New Adventures spin off novel Original Sin by Andy Lane.
• The soundtracks for The Invasion and The Tenth Planet along with a bonus disc, The Origins of the Cybermen, an audio essay by David Banks, were released in a collector's tin called Doctor Who: Cybermen.
• It is later claimed in Spearhead from Space that the events in The Invasion where kept from the public. How this was possible when the entire population of Earth all collapsed at the same time is never explained. In Remembrance of the Daleks, the Doctor suggests that humans have an "amazing capacity for self-deception".
• The Cybermen mention having encountered the Doctor previously on "Planet 14". Since this story takes place, chronologically, before The Tomb of the Cybermen, Planet 14 is most likely not Telos and suggests an untelevised adventure. However, given the time travelling nature of the Doctor and the ability of the Cybermen to recognise the Doctor despite his regenerations, which incarnation encountered the Cybermen is uncertain. In the Doctor Who Magazine comic strip story The World Makers (DWM #127-#129), it was revealed that the Doctor in question was the Sixth Doctor, and that Planet 14 was Marinus. That story, taking place prior to The Tenth Planet in Cyber-history, also stated that the Voord evolved into the Cybermen and that Marinus eventually became Mondas, the Cyberman homeworld. The canonicity of the comic strips, like the other Doctor Who spin-off media, is unclear.
• Episodes 1 and 4 of this serial are missing from the BBC archives.