Every child is scared of monsters, but George's terrified pleas for help reach the Doctor. Because George's monsters are real.

Clara is alone in Victorian London with a man she doesn't know, a dinosaur in the Thames, and a spate of deadly spontaneous combustions. The Doctor has changed. It's time you knew him.

The Doctor and Romana visit the Leisure Hive on the planet Argolis, the surface of which is uninhabitable following a twenty minute nuclear war between the Argolins and their enemies the Foamasi. The Argolins themselves are now sterile. Pangol, the youngest, was created by the Tachyon Recreation Generator, a machine that runs games in the Hive.

The final segment of the Key is traced to the planet Atrios, engaged in a long war with the neighbouring Zeos. The Marshal of Atrios intends a final strike to destroy the Zeons, but the Doctor and Romana discover that Zeos is deserted and the war is being co-ordinated by a computer called Mentalis, built by one of the Doctor's old Time Lord Academy friends, Drax.

The final segment of the Key is traced to the planet Atrios, engaged in a long war with the neighbouring Zeos. The Marshal of Atrios intends a final strike to destroy the Zeons, but the Doctor and Romana discover that Zeos is deserted and the war is being co-ordinated by a computer called Mentalis, built by one of the Doctor's old Time Lord Academy friends, Drax.

The TARDIS materializes on Earth.

The Doctor and Romana encounter strange monsters as they explore the connection between the stone circle and the missing Key segment.

In a South Yorkshire city, Ryan Sinclair, Yasmin Khan, and Graham O'Brien are about to have their lives changed forever as a mysterious woman, unable to remember her own name, falls from the night sky.

The Doctor join forces with a masked Superhero for an epic New York adventure. With brain-swapping aliens poised to attack, the Doctor and Nardole link up with an investigative reporter and a mysterious figure known only as The Ghost.

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