S1.E1 ∙ Menace: Part 1 - The SleepersThu, Apr 4, 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 SmokeThu, Apr 11, 1968Bill and Chris track the kidnapped sailors to Von Gelb's hideout, where they discover his plans.Rate
S1.E3 ∙ Menace: Part 3 - The CampThu, Apr 18, 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 UltimatumThu, Apr 25, 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 FaceThu, May 2, 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 CooksThu, May 9, 1968Ships are disappearing from the ocean without a trace.Rate
S1.E7 ∙ Recipe for Danger: Part 2: One Man's MeatThu, May 9, 1968Something suspicious is going on at the Eureka cookery school.Rate
S1.E8 ∙ Recipe for Danger: Part 3: Trouble BrewingThu, May 23, 1968Can the teenagers prevent the "Tromso" from being the next stolen ship?Rate
S1.E9 ∙ Recipe for Danger: Part 4: Bring to the BoilThu, May 30, 1968Buchan discovers the deadly secret of Von Gelb's stolen fleet.Rate
S1.E10 ∙ The Big Freeze: Part 1: IcarusThu, Jun 6, 1968Eleven of the world's most eminent scientists have disappeared and Terry is kidnapped.Rate
S1.E11 ∙ The Big Freeze: Part 2: ValkyrieThu, Jun 13, 1968Buchan discovers the power of Von Gelb's mind control device.Rate
S1.E12 ∙ The Big Freeze: Part 3: AnvilThu, Jun 20, 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: GotterdammerungThu, Jun 27, 1968Buchan has a plan to destroy Anvil, but is it too dangerous?Rate