Gerry Anderson Encyclopedia
"We will destroy key-links in your Frost Line Outer Space Defence System"

Avalanche is the eleventh produced, and the fifth broadcast, episode of the British television series Captain Scarlet and the Mysterons.


When the Mysterons target an outer-space missile complex, it's up to Captain Scarlet and Lieutenant Green to keep it safe...


The Frost Line Outer Space Defence System is a network of missile complexes stretching 3,000 miles across North America, dedicated to protecting Earth against extraterrestrial threats.

When the Mysterons announce their intention to destroy key Frost Line bases, they kill Eddie - a maintenance engineer - by causing his truck to crash, and then reconstruct him. First targeting the Red Deer and Cariboo Bases, the Mysteron agent gets past both stations' security and places devices inside their ventilation systems, rendering the air unbreathable - killing 250 men at Red Deer, and another 70 at Cariboo...

On Cloudbase, Colonel White orders Captain Scarlet and Lieutenant Green to investigate Red Deer and find out the Mysterons' exact method of attack. General Ward, the belligerent Frost Line commander, states that he'll launch missiles against Mars if more bases are knocked out - and White fears the Mysterons' response, should Ward make good on that threat...

At Red Deer, Scarlet and Green eventually discover that the personnel suffocated not due to poisonous gas, but because all the oxygen in the air has been removed. Having requisitioned an SPV from a nearby hunter's lodge, the two officers rush to the next base, Big Bear - only to discover that the Mysteronised Eddie has already passed through, and is now headed towards the Frost Line Command Centre...

After knocking out the sentry - who's under orders from Ward to prevent Spectrum from entering the base - Green extracts Eddie's oxygen-depletion device from the ventilation system, before it can affect the air. Meanwhile, Scarlet chases Eddie in the SPV. The truck is carrying a large payload of liquid oxygen, some of which Eddie empties onto the path of the oncoming SPV to force Scarlet off the road...

Realising that Eddie may deliberately crash the truck into his target to ignite the combustible substance and obliterate the Command Centre, Scarlet fires several shots from his gun into the snow-lined slope on one side of the track, opposite a sheer drop. This causes an avalanche, which throws the truck over the edge, crashing down the rock face where it finally explodes, killing Eddie and saving the Command Centre.


Regular Cast

Guest Cast

Cameo Roles


Captain Scarlet and the Mysterons
CaptainScarlet Logo.png

Spectrum: Captain ScarletCaptain BlueColonel WhiteLieutenant GreenDestiny AngelCaptain BlackSymphony AngelCaptain BrownRhapsody AngelCaptain GreyMelody AngelCaptain OchreHarmony AngelCaptain MagentaDoctor FawnCaptain IndigoSpectrum Guards
Others: The MysteronsWorld President YoungerLieutenant DeanNavigator ConwayDirector-General Xian YohDelta Garage AttendantDT19 PilotDT19 Co-PilotAirport ChiefAirport OperatorDirector-General ImpersonatorSpectrum Agent 042AssassinMacey1st London Police Officer2nd London Police Officer3rd London Police Officer4th London Police Officer5th London Police Officer6th London Police OfficerWoman DriverHarris (Manhunt)Security Chief RichardsGeiger OperatorDelta Garage MechanicCulver Guard 1Culver Guard 2General WardEddieSergeant MarshallLieutenant BurroughsTrapperRed Deer Sentry JoeCariboo SentryBig Bear SentryDead BodyBob LynnTVR-17 ControllerHelijet PilotUSS Panther II CaptainLieutenant BelmontSoamesDavidsonClarkCommodore GoddardCaptain HoltMortonDistillery AttendantDr. Theodore MagnusGeneral TiempoDr. Turner1st Medical Student2nd Medical StudentPorter BensonRadiographerNurse (Operation Time)MorganDoctor (Operation Time)General PetersonDoctor Giadello1st Warden (Post 14)2nd Warden (Post 28)MasonSteeleKramerDice Club CroupierBarmanNuclear City Security ChiefAttendant Delta garageKrugerDoigCarlFire WardenLunar ControllerOrsonS.I.DShuttle PilotSupreme Commander of Earth ForcesColonel StormMajor BrooksGeneral CopeCaptain HasselPeteMCA Tanker Driver's MateArabAndre VerdainHelgaGabrielleCasino commissionaireModelFairfieldJacksonFire ChiefMajor StoneJoe JohnsonPhil MachinMajor ReevesLinda NolanFrazerShroederDoctor BreckDoctor CarterDoctor AngeliniDoctor KurnitzDoctor Kurnitz' SecretaryKinleyCharlie HansenJason SmithMajor GravenerDoctor BaxterDoctor MitchellNurse (Treble Cross)Harris (Treble Cross)Doctor Ernst ConradBill WilliamsNewspaper ReporterJoe (Flight 104)Doctor DentonJudith ChapmanAirport MechanicGeneral RebusNeilsonRhoadesCaptain (Expo 2068)Doctor SommersDriver (Expo 2068)Seneca PilotLumberjack (Expo 2068)RaynorMervin BrandPresident RobertsVice PresidentVice-president's WifeProfessor Gabriel CarneyPresident Conrad OlafsonPresident John L. HendersonSKR4 CaptainSKR4 NavigatorMajor MoranSergeant (Inferno)Commander WilliamsMaxwell Airbase SergeantColganMysteron Agent (The Inquisition)

TV Series Episodes:
The MysteronsWinged AssassinBig Ben Strikes AgainManhuntAvalancheWhite as SnowThe TrapOperation TimeSpectrum Strikes BackSpecial AssignmentThe Heart Of New YorkLunarville 7Point 783Model SpySeek and DestroyTraitorRenegade RocketCrater 101Shadow Of FearDangerous RendezvousFire at Rig 15Treble CrossFlight 104Place of AngelsNoose of IceExpo 2068The LaunchingCodename EuropaInfernoFlight to AtlanticaAttack on CloudbaseThe Inquisition

Audio Adventures:
Introducing Captain ScarletCaptain Scarlet and the MysteronsCaptain Scarlet is IndestructibleCaptain Scarlet of SpectrumCaptain Scarlet versus Captain Black

Young CorgiThe Vault

CloudbaseMaximum Security Building

Vehicles and Craft:
Spectrum Saloon CarSpectrum Pursuit VehicleMaximum Security VehicleAngel InterceptorSpectrum Passenger JetSpectrum HelicopterSpectrum HovercraftSpectrum Radar VanMagnacopterZero-X