 For four years, Episode 1 of Invasion of the Dinosaurs was the only Pertwee episode to be entirely missing from the archives, until a black-and-white 16 mm copy was returned to the Corporation in June 1983. The story was released on DVD with a partially recolourised version of Episode 1, alongside a higher-quality monochrome transfer of the episode, in The UNIT Files box set. With one exception, archival holdings from Death to the Daleks Episode 2 onwards are complete on the original broadcast videotapes.
