With Steve and Venus on vacation, Commander Zero is left to look after Zoonie the Lazoon, who causes havoc in Space City with Commander Zeros' son, Jonathan.

As Steve celebrates the anniversary of his family's circus act, Venus falls asleep and dreams of a plot devised by Mr and Mrs Space Spy and the nomadic Monadians to take over the Earth…

To capture a group on criminals, Steve, Matt and Venus pretend to steal XL5.

Fireball XL2 has crashed on Planet Monotane, and Fireball XL5 is sent to investigate, only to run into a sort of space dinosaur...

The XL5 becomes caught in the gravitational pull of planet Megneton and discovers the plot by the Solars to bring the Earth's moon into their orbit.

While babysitting Commander Zero's son, Jonathan, Venus tells him story about when Fireball XL5 encountered a group of space pirates.

Venus and Prof. Matic are about to set off in the Mayflower 3 to colonise the nearby planet, New Earth. But the Advance Scout has been kidnapped by two evil midgets who plan to hold the new immigrants captive.

When experimenting with a new warhead in space, Steve Zodiac is forced to save Venus from the clutches from the sinister Cult of Miras before she can be sacrificed to their sun-god...

On planet Floran, the crew of XL5 try to discover what is killing the plants there, however the native people believe they are an invasion force and drug their food.

While drawing a schematic for a new radar screen, Lt. Ninety is surprised to find himself promoted to the rank of General!

Kernak, ruler of Kemple plots the resettlement of his people to Planet Olympus by poisoning Olympus' ruler's son. Venus and Matt are captured and must be rescued by Steve.

Matt completes his new time machine and sends Robert back to 1875, but Steve, Venus and Zero are accidently sent back as well.

Major Jim Ireland returns to Earth after 10 years in space, but unknown to everyone, he has become an agent for Kudos, the only survivor from the planet Zanadu, who wants revenge on all Lazoones for destroying his people.

The Fireball XL5 foils an attempted bombing while transporting the King of Platonia and is caught in the middle of the plot to assassinate the King and sent two planets into war.

After intercepting a missile on course for earth, Steve Zodiac and the crew of the XL5 travel to Planet 46 and discover the Subterrains who launch another missile at the earth with Venus trapped inside.

The Fireball XL5 narrowly misses a planet that bas broken out of it's orbit and realize the planet is on a collision course for the planet Membrono. After concluding the planets are uninhabited, Steve realizes he saw a flying saucer and after the ship lands at Venus' house, the XL5 is lured back to save the planet Membrono from destruction.

After a blackout at Space City, a missile gets through the radar blackout, and is heading towards Space City with a dangerous cargo...

Everyone on planet Zolpheid is killed in an Aquaphibian attack, except for Rald and Jerek. Receiving an SOS, Space City sends Fireball XL5 to rescue the two from Zolpheid's oceans.

After detecting a series of massive explosions in space, Steve and the crew of XL5 find a planet three times bigger than Earth, but they soon crash land...

After top secret plans are stolen from Earth, XL5 enocunters Boris and Griselda, but Matt is captured.

Whilst on patrol, the XL5 comes across the wreck of an old spaceship. Setting out to investigate, they find it to be the TA2, that disappeared in the 2020's, and the hunt is on to find her pilot...

Lt. 90 qualifies for his astronauts wings by landing XL5 in one piece and then piloting XL1 off the launch rail, but on his return to Earth in a capsule, he finds it has caught fire!

The crew of XL5 encounter Boris and Griselda the space pirates on the Companion 12 space station.

On Planet 46, the Subterraineans plan revenge on Zodiac and send a robot bird to infect him with radium.

On Planet 73, two scientists working at a mineral research lab discover that they in the path of six tanks controlled by Granatoid robots. They can only be stopped using a rare material, but all the supplies have run out!