released on DVD. Episodes of Sykes and Public Eye have also been treated for DVD. A few 1960s Doctor Who episodes, all starring William Hartnell, did not undergo the VidFIRE process: Part One of The Crusade - "The Lion", and parts 1-4 of The Time Meddler were not processed because it was deemed that the damage to the films rendered the video effect unconvincing. All were finally given the process in 2022 for the Season Two Blu-ray boxset. An easter egg included on the DVD release of The Tomb of the Cybermen featured a brief clip from that serial with VidFIRE processing applied. This was an experiment by the Doctor Who Restoration Team to see how well VidFIRE would survive the MPEG-2 encoding process. The experiment demonstrated that the VidFIRE illusion was not diminished by MPEG encoding and so the next relevant DVD release, The Aztecs, was VidFIREd in its entirety. The Tomb of The Cybermen has since been re-issued on DVD in entirely VidFIREd form as part of the Revisitations 3 box set. A slightly revised version of the process, with an improved motion-estimation engine, was first used on the BBC's 2005 DVD release of Quatermass and the Pit (as part of The Quatermass Collection) and then on all subsequent relevant Doctor Who DVD releases. The 1970s Doctor Who serials to have undergone the VidFIRE process are: Doctor Who and the Silurians, The Ambassadors of Death (episodes 2-7; episode 1 remains on original 2-inch tape), Inferno, Terror of the Autons, The Mind of Evil, The Claws of Axos (only Episodes 2 and 3), The Daemons (only episodes 1-3 and 5), Planet of the Daleks (only episode 3) and Invasion of the Dinosaurs (only episode 1). Beyond this, the technique (although critically applauded) has seen relatively little exposure, perhaps because of a belief within the broadcasting industry that public interest in the kind of archive television that would benefit from VidFIRE is insufficient to justify the cost of processing. References External links Doctor Who Restoration Team The Pamela Nash Experience--"TV Technology" (highly detailed articles on quadruplex videotape, film recording, and the BBC's early VERA system) Allan, Keri, "Memories are Made of This'", an introduction to techniques used to restore archive TV, including VidFIRE and advanced PAL decoding Interview with Peter Crocker of SVS Resources Film and video technology British inventions