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Dh’ fhàs deuchainnean niùclasach nas cumhachdaiche, agus tha bomairean agus itealain brathaidh a’ sgeith nas fhaide tuath. Tha na Stàitean Aonaichte ag àrdachadh na tha iad a’ dèanamh anns a’ Ghraonlainn, fhad ’s a tha an t-Aonadh Sobhieteach a’ fosgladh làrach deuchainn niùclasach anns a’ cheann a tuath. Tha an treas prògram de Sgeulachd Cogaidh na h-Artaig – An Cogadh Fuar a’ leantainn mar a tha beachdaireachd ag adhbharachadh gu bheil riaghailtean air am briseadh a thaobh crìochan agus fànas-adhair anns an Fhionnlainn. Air sgàth gum b’ urrainn ionnsaigh a bhith ann, tha Nirribhidh a’ neartachadh na loidhnichean dìon sa Cheann a Tuath agus tha iad ag àrdachadh an àireamh de shaighdearan. Tha an t-Suain air fhaicinn mar chumhachd niùclasach san àm ri tighinn, agus ’s ann an sin a tha an ceathramh feachd adhair as làidire anns an t-saoghal.

Nuclear tests become more powerful, while bombers and spy planes fly farther north. The US increases its activities in Greenland, while the Soviet Union opens a new nuclear test site in the north.

The third episode follows how the escalating espionage leads to border and airspace violations in Finland. Due to the increased threat of attack, Norway strengthens its northern defence lines and increases the number of troops. Sweden is seen as a potential future nuclear power and it also has the world's fourth-strongest air force.

Dubbed in Gaelic with English subtitles.