Last updated 09 January 2020


Part One

Part One

Series Episode Number: 518

World Premiere: Sat 24 Nov 1979 - 6:01pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 1 Nov 1981 - 11:00pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 17 seconds

8.70 Million (UK)


Chart Position: 41 () (UK)

Recorded on Sun 12 Aug 1979 in Television Centre 6



A terrible hyperspace accident results in two starships becoming locked together. The Doctor arrives and discovers that the incident may have also released a deadly menace.


Characters hide uncredited
Doctor WhoTom Baker
RomanaLalla Ward
TrystLewis Fiander
RiggDavid Daker
DymondGeoffrey Bateman
DellaJennifer Lonsdale
SeckerStephen Jenn
CrewmanRichard Barnes
Voice of K-9David Brierley
Computer VoicePamela Ruddock (uncredited)
CrewmanDavid Cole (uncredited)
CrewmanMark Kirby (uncredited)
CrewmanSimon Sutton (uncredited)
CrewmanTerence Creasy (uncredited)
MandrelJames Muir (uncredited)
MedicGary Dean (uncredited)
MedicReg Turner (uncredited)
PassengerAnn Garry Lee (uncredited)
PassengerAudrey Searle (uncredited)
PassengerDerek Hunt (uncredited)
PassengerDerek Hunt (uncredited)
PassengerGreg Marlow (uncredited)
PassengerJay Roberts (uncredited)
PassengerJean Channon (uncredited)
PassengerJenny Roberts (uncredited)
PassengerJudy Rodger (uncredited)
PassengerMadelaine Simpson (uncredited)
PassengerPat Judge (uncredited)
StewardessSally Sinclair (uncredited)
StottBarry Andrews (uncredited)
Wounded PassengerBilly Gray (uncredited)