Attempting to outwit a band of space pirates who are plundering freighters, the XL5 crew are drawn into a complicated game of bluff and double bluff.

Intro guest: John Lee.

Marineville is targeted by a series of missiles fired from a seemingly uninhabited island.

Intro guest: John Lee.

The ransom is paid and the hostages released, but the Protectors and the police must work out how the woman was involved.

Intro special guest: Genevieve Gaunt.

The daughter of a wealthy man is involved in a hostage situation at a ski resort, with skiers held for ransom.

Intro special guest: Genevieve Gaunt.

Tex and Dusty go off in search of a gun runner selling to renegade Indians, led by Red Scalp.

Intro special guest: Anton Phillips.

The Alphans celebrate the arrival of the first child born on the Moon. The blessed event sours when the infant grows into a five-year-old child in minutes. Trying to accept him, the Alphans do not notice that little Jackie Crawford is much more than he seems. When hostile spaceships approach the base, Koenig realises, too late, that the aliens have an agent on Alpha.

Intro special guest: Anton Phillips.

MOID perfects the greatest disguise of all: the invisible man.

Intro guest: Ayshea Brough.

A club owner hires the Protectors to guard his niece, who is a witness in a murder trial.

Intro special guest: Ayshea Brough.

Captain Black reveals that, using Mysteron technology, that he now has control over all the digital systems on Earth and can destroy them at will. The Mysterons then speak through the rogue agent, demanding mankind's surrender in twenty-four hours or else they will trigger a world-wide technological failure that will destroy everyone on the planet. With humanity's surrender as the price, how can Spectrum carry on the fight with weapons that do not work?

Masterspy steals the plans for Supercar, but he doesn't keep them for long.

Intro special guest: Roland Moore.