An investigation of a flying saucer leads Zodiac to try to save a planet that has broken out of its orbit and is on a collision course with another planet.

Agent X-20 plants a bomb on Stingray while Lieutenant Fisher is using the vessel for target practice.

Intro special guest: Ellie Collins

Assuming the skills of a leading virologist, Joe tries to steal the antibody for a deadly virus before it can be used to attack the West.

The Mysterons target the oil refinery that supplies fuel for all of Spectrum's vehicles.

While investigating strange signals coming from Planet 46, Zodiac is poisoned by a robot bird equipped with deadly radium capsules. Venus saves his life, but the bird is waiting to strike again.

Agent X-20 creates false underwater soundings in an attempt to mislead Phones and have him dismissed from duty.

Pedro and Fernando team up with Red Scalp to plot against Tex.

A criminal organisation steals classified plans. Working in conjunction with a British Secret Service agent, Lady Penelope must recover the material to save the world from total destruction.

British Intelligence use the Contessa as bait to capture an assassin who has targeted their agents, however there is a twist when the supposed assassin reveals himself.

According to legend, when the two suns eclipse on planet Bharron, once every thousand years, Lavender Castle can be seen in the desert. Captain Thrice and Walking Stick mount an expedition into the desert, but on the third day, the Captain loses Walking Stick when he falls into a gully. Alone in an endless desert, Thrice finds himself at the mercy of Dr. Agon.