S1.E1 ∙ Menace: Part 1 - The SleepersWed, Apr 3, 1968Bill Cowan and Terry Driver discover that the complete crew of a nuclear submarine have been abducted from the London to Portsmouth train.Rate
S1.E2 ∙ Menace: Part 2 - No SmokeWed, Apr 10, 1968Bill and Chris track the kidnapped sailors to Von Gelb's hideout, where they discover his plans.Rate
S1.E3 ∙ Menace: Part 3 - The CampWed, Apr 17, 1968Von Gelb has gained control over a fully armed nuclear submarine, but is unaware that the three teenagers are on his trail.Rate
S1.E4 ∙ Menace: Part 4 - The UltimatumWed, Apr 24, 1968Von Gelb demands £100 million in diamonds and demonstrates his intentions by launching one of the Polaris missiles.Rate
S1.E5 ∙ Menace: Part 5 - Face to FaceWed, May 1, 1968With his threat against Britain successful, Von Gelb turns his attention to the rest of the world. But Buchan is on his trail.Rate
S1.E6 ∙ Recipe for Danger: Part 1: Too Many CooksWed, May 8, 1968Ships are disappearing from the ocean without a trace.Rate
S1.E7 ∙ Recipe for Danger: Part 2: One Man's MeatWed, May 8, 1968Something suspicious is going on at the Eureka cookery school.Rate
S1.E8 ∙ Recipe for Danger: Part 3: Trouble BrewingWed, May 22, 1968Can the teenagers prevent the "Tromso" from being the next stolen ship?Rate
S1.E9 ∙ Recipe for Danger: Part 4: Bring to the BoilWed, May 29, 1968Buchan discovers the deadly secret of Von Gelb's stolen fleet.Rate
S1.E10 ∙ The Big Freeze: Part 1: IcarusWed, Jun 5, 1968Eleven of the world's most eminent scientists have disappeared and Terry is kidnapped.Rate
S1.E11 ∙ The Big Freeze: Part 2: ValkyrieWed, Jun 12, 1968Buchan discovers the power of Von Gelb's mind control device.Rate
S1.E12 ∙ The Big Freeze: Part 3: AnvilWed, Jun 19, 1968Von Gelb has complete control over the weather and shows he is not afraid to use it.Rate
S1.E13 ∙ The Big Freeze Part 4: GotterdammerungWed, Jun 26, 1968Buchan has a plan to destroy Anvil, but is it too dangerous?Rate