Last updated 24 March 2024


Part Two

Series Episode Number: 604

World Premiere: Fri 6 Jan 1984 - 6:41pm GMT [BBC One] (United Kingdom)
First Broadcast: Fri 8 May 2015 - 8:30pm EDT [Retro TV]
Running Time: 24 minutes 4 seconds

7.50 Million (UK)

Appreciation Index: 64 (UK)

Chart Position: 52 () (UK)




The Silurians and Sea Devils send in the Myrka to spearhead their invasion of the Seabase. Meanwhile, Nilson and Doctor Solow work to bring the entire Bloc down


Characters hide uncredited
The DoctorPeter Davison
TeganJanet Fielding
TurloughMark Strickson
VorshakTom Adams
SolowIngrid Pitt
NilsonIan McCulloch
BulicNigel Humphreys
MaddoxMartin Neil
PrestonTara Ward
IctharNorman Comer
KarinaNitza Saul
ScibusStuart Blake
TarpokVincent Brimble
SauvixChristopher Farries
ParoliJames Coombes
Marine/GuardJulian Hudson (uncredited)
Marine/GuardBarney Lawrence (uncredited)
Marine/GuardPeter Caton (uncredited)
Marine/GuardDana Miche (uncredited)
Marine/GuardJulian Larousse (uncredited)
Marine/GuardRose Pridmore (uncredited)
Marine/GuardDorothy Ottey (uncredited)
Marine/GuardRidgewell Hawkes (uncredited)
Marine/GuardTrevor Steedman (uncredited)
Sea Base PersonnelJoanna Garcia (uncredited)
Sea Base PersonnelLing Tai (uncredited)
Sea Base PersonnelJoycea Goborn (uncredited)
Sea Base PersonnelArnold Lee (uncredited)
Sea Base PersonnelRussell Brook (uncredited)
Sea DevilSteve Kelly (uncredited)
Sea DevilChris Wolff (uncredited)
Sea DevilJules Walters (uncredited)
Sea DevilMike Brayburn (uncredited)
Sea DevilDave Ould (uncredited)
MyrkaJohn Asquith (uncredited)
MyrkaBill Perrie (uncredited)
Production Team include uncredited
WriterJohnny Byrne
DirectorPennant Roberts
ProducerJohn Nathan-Turner
DesignerTony Burrough
Script EditorEric Saward
Title SequenceSid Sutton
Costume DesignerJudy Pepperdine
Make-up ArtistJennifer Hughes
LightingPeter Smee
SoundMartin Ridout
Technical ManagerAlan Arbuthnott
Camera SupervisorBob Baxter
Camera SupervisorAlec Wheal
Videotape EditorHugh Parson
Visual Effects DesignerMat Irvine
Video EffectsDave Chapman
Vision MixerNigel Finnis
Technical Manager(TM2)Alan Woolford
OB Camera SupervisorAlastair Mitchell
OB SoundChris Holcombe
Production ManagerMichael Darbon
Production AssociateJune Collins
Production AssistantNorma Flint
Assistant Floor ManagerAdrian Hayward
Incidental MusicJonathan Gibbs
Special SoundDick Mills
Title Music BBC Radiophonic Workshop
Special Sound BBC Radiophonic Workshop