Last updated 09 January 2020

Part One

Series Episode Number: 496

World Premiere: Sat 23 Dec 1978 - 6:17pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 20 Sep 1981 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 23 minutes 16 seconds

6.50 Million (UK)

Chart Position: 85 () (UK)

Recorded on Mon 09 Oct 1978 in Television Centre 6

Tracing the fifth segment of the Key to Time to the third moon of Delta Magna, the Doctor and Romana are soon caught up in the conflict between humans and the Swampies.

Characters hide uncredited
Doctor WhoTom Baker
RomanaMary Tamm
ThawnNeil McCarthy
RanquinJohn Abineri
FennerPhilip Madoc
Rohm DuttGlyn Owen
VarlikCarl Rigg
SkartFrank Jarvis
DugeenJohn Leeson
HargGrahame Mallard
MenschTerry Walsh
(extra)Philip Bird (uncredited)
(extra)Richard Edmunds (uncredited)
(extra)Mark Hardy (uncredited)
(extra)Barry Stearn (uncredited)
(extra)Norman Clive-Fisher (uncredited)
(extra)Curtis Dabek (uncredited)
(extra)Steve Palmer (uncredited)
(extra)Stave Sandis (uncredited)
(extra)David Babin (uncredited)
(extra)Graham Baker (uncredited)
(extra)Paul Mann (uncredited)
(extra)Steve Vickers (uncredited)
(extra)Stephen Pleasance (uncredited)
(extra)Peter Crutchlew (uncredited)
(extra)Paul Smith (uncredited)
(extra)John Hodges (uncredited)
(extra)Julian Mark (uncredited)
(extra)David Sinclair (uncredited)
(extra)Mike Wilson (uncredited)
(extra)Michael Archer (uncredited)