After an atomic explosion blasts the Moon out of Earth orbit, Moonbase Alpha drifts in space, with 300 people on board. When a rescue team from Earth arrives in a faster-than-light space ship, everyone is overjoyed that they can now return to Earth. But Moonbase Commander John Koenig, having undergone an experimental brain soothing process after receiving a concussion in a crash on the Lunar surface, sees not friends from Earth but gruesome monsters which have telepathically caused all others on Alpha to see an illusion of an Earth party. The aliens are desperate for radiation and plan to manipulate the Alphans into detonating nuclear waste on the Lunar surface, reducing the Moon and everyone on it to dust. Koenig must expose this conspiracy to save his people. Compiled from the two part episode The Bringers Of Wonder from the TV series Space: 1999's second series.

The different aspects of life in Pompeii, a coastal luxury resort near Naples catering for the very rich of imperial Rome, mainly before but culminating in the eruption of the Vesuvian volcano, which wipes it from the face of the Earth. The residents of Pompeii include Diomed, a common upstart merchant whose self-made riches from trade allow him to consider running for political office against sitting city magistrate Quintus and an impoverished aristocratic marriage for his daughter Julia; the cultivated Greek Glaucus; the gladiator Lydon; the noble-born Antonius and his sister Ione, the evil Isis-priest Arbaces who is after (their) money and power; the persecution-fearing Christian slaves Petrus, his true love Chloe, and their secret leader Olinthus.