Doctor Who
Terror of the Zygons, Part Four
TV Flash files “Terror of the Zygons, Part Four” as hour 405 of 700 in the TV Flash guide — Doctor Who (1963–) on BBC, season 13, episode 4, aired 1975-09-20, 25 min.
From the desk
How this hour is filed
This leaf is S13E04: listed hour 405 of 700 in the Doctor Who guide, hour 4 of 26 in season 13. It aired 1975-09-20 (25 min). The listed hour before it is “Terror of the Zygons, Part Three” (S13E03). Next is “Planet of Evil, Part One” (S13E05). Broadcast log — titles and dates, not a plot bible.
Catalog log
Broadcast listing — not a TV Flash recap.
UNIT attempt to track down the Zygon ship while Broton prepares to have the Skarasen attack London.
Viewer FAQ
Where does Terror of the Zygons, Part Four sit in the Doctor Who guide?
S13E04 is listed hour 405 of 700 — hour 4 of 26 in season 13, season 13 episode 4.
When did Doctor Who S13E04 air?
Terror of the Zygons, Part Four aired 1975-09-20 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…