Forbidden to continue his travels through time and space by his fellow Time Lords, the newly regenerated Doctor begins his exile on Earth and finds himself hurled into one of his most exciting and terrifying adventures. But the Doctor is not the only alien intelligence arriving on the planet. A shower of mysterious meteorites signals the coming of the Nestene Consciousness – an evil, cosmic, collective being with just one goal – total conquest of Earth. The Nestenes possess a special ability to control plastic and are making hordes of Autons – indestructible, armed, plastic mannikins, only awaiting the Nestene command to start their killer rampage.
A race of intelligent reptiles wakes from hibernation in the caves beneath Derbyshire, and sets about reclaiming the planet as their own.
When all communication is lost from Mars Probe 7 shortly after jt leaves. Mars and begins its trip back to Earth, a second craft is launched to investigate. As Recovery 7 docks in space, it too loses all communication The Doctor and UNIT are given the task of investigating the mystery, as Recovery 7 returns to Earth.
It appears that no one can be trusted, as the space capsule is hijacked from its UNIT convoy With, military precision. What has happened to the missing astronauts? Could this be a secret invasion from Mars, or is the enemy much closer to home?
20th Century Earth. An unhinged scientist, Professor Stahlman, is attempting the first penetration of the Earth’s crust in a top secret drilling project called Inferno. His purpose? To tap into a new energy source at the core. But at what cost? When the Doctor is called in with his companion Liz Shaw to oversee the project, he soon develops grave misgivings. Things begin to go very wrong when a mysterious green substance leaks from the drillhead. A substance which turns all who come into contact with it into alien primeval creatures called Primords.