Prod. code
SCA 10
First air date
Friday, October 27, 1967
Running time


The Frost Line Outer Space Defense System in Northern Canada is the next target of the Mysterons. Captain Scarlet and Lieutenant Green are sent to investigate and put an end to the Mysterons evil plan.

Mysteron threat

This is the voice of the Mysterons. We know that you can hear us, Earthmen. Our next strike is imminent. We will show you how weak you really are. Within the next few hours, we will destroy key links in your Frost Line Outer Space Defense System. We will be avenged.

Characters in order of appearance 16

Credits 39

  • Director

    Brian Burgess

  • Teleplay

    Shane Rimmer

  • Art director

    Grenville Nott

  • Assistant director

    Keith Lund

  • Associate producer

    John Read

  • Camera operator

    Alan McDonald

  • Characters created by

    Sylvia Anderson

  • Designer

    Keith Wilson

  • Dialogue editor

    Don Brill

  • Dialogue synchronisation

    James Cowan

  • Executive producer

    Gerry Anderson

  • Format

    Gerry & Sylvia Anderson

  • Lighting cameraman

    Paddy Seale

  • Music composed and directed by

    Barry Gray

  • Music editor

    George Randall

  • Producer

    Reginald E. Hill

  • Production manager

    Frank Hollands

  • Property master

    Arthur Cripps

  • Puppet operator

    Judith Morgan
    Jan King

  • Puppetry co-ordination

    Mary Turner

  • Puppetry supervision

    Christine Glanville

  • Script editor

    Tony Barwick

  • Sculptor

    Ernest Shuttas Plugg ShuttTim Cooksey
    Terry Curtis

  • Special effects director

    Jimmy Elliott

  • Supervising art director

    Bob Bell

  • Supervising editor

    Len Walter

  • Supervising sound editor

    Peter Pennell

  • Supervising special effects director

    Derek Meddings

  • Visual effects 2nd unit camera operator

    Ted Cutlack

  • Visual effects 2nd unit director

    Peter Wragg

  • Visual effects 2nd unit lighting cameraman

    Ted Wooldridge

  • Visual Effects Lighting Cameraman

    Bert Mason

  • Visual effects production manager

    Harry Ledger

  • Wardrobe

    Iris Richens

  • Editor

    Harry McDonald