Doctor Who
Terror of the Zygons, Part Three
TV Flash files “Terror of the Zygons, Part Three” as hour 404 of 700 in the TV Flash guide — Doctor Who (1963–) on BBC, season 13, episode 3, aired 1975-09-13, 25 min.
From the desk
How this hour is filed
This leaf is S13E03: listed hour 404 of 700 in the Doctor Who guide, hour 3 of 26 in season 13. It aired 1975-09-13 (25 min). The listed hour before it is “Terror of the Zygons, Part Two” (S13E02). Next is “Terror of the Zygons, Part Four” (S13E04). Broadcast log — titles and dates, not a plot bible.
Catalog log
Broadcast listing — not a TV Flash recap.
The Doctor and the Brigadier begin to realise who the Zygon imposters among them are while Sarah discovers a secret tunnel to the underwater ship.
Viewer FAQ
Where does Terror of the Zygons, Part Three sit in the Doctor Who guide?
S13E03 is listed hour 404 of 700 — hour 3 of 26 in season 13, season 13 episode 3.
When did Doctor Who S13E03 air?
Terror of the Zygons, Part Three aired 1975-09-13 and is listed at 25 minutes.
Where should I start with the 1960s serials?
William Hartnell's First Doctor is the origin of the TARDIS-and-companions contract. Patrick Troughton's Second Doctor is the proof that regeneration works. Start at a serial whose surviving episodes interest you; missing-episode gaps are part of the classic-era weather.
In the series
Why this series still plays
A Time Lord, a police box bigger on the inside, and regeneration as infinite franchise life: Doctor Who launched from the BBC in 1963 and never really parked. Early black-and-white serials built the mythology; Hartnell-to-Troughton proved the lead could change without ending the show. The longest experiment in serialized reinvention — woolly, weird, endlessly renewable.
November 23, 1963, is a drop that never really parked. BBC's *Doctor Who* launched a Time Lord and a blue police box bigger on the inside, then treated the lead as renewable inventory. **Regeneration is the window.** Sydney Newman, C. E. Webber, and Donald Wilson were among the early architects. Early black-and-white serials built the mythology; companions, sonic screwdrivers, and cliffhangers became ritual. Rex wants woolly national inheritance. Fine. The business model is recasting without ending the show.
Filed against
- William Hartnell as The First Doctor
William Hartnell’s First Doctor launched Doctor Who from the BBC in 1963 — a Time Lord, a police box bigger on the inside, regeneration as infinite franchise life. Early black-and-white serials built the mythology; Hartnell-to-Troughton…
- Patrick Troughton as The Second Doctor
Patrick Troughton played the Second Doctor on Doctor Who, the 1960s BBC proof that a Time Lord could change faces without ending the franchise. Police box bigger on the inside, regeneration as infinite life, early black-and-white serials…
- Jon Pertwee as The Third Doctor
Jon Pertwee’s Third Doctor kept Doctor Who’s police box moving — a Time Lord, a box bigger on the inside, regeneration as infinite franchise life. BBC serials launched in 1963 and never really parked; Hartnell-to-Troughton proved the lead…