Nicholas Briggs and Anneke Wills

The TARDIS brings the Doctor, Ben and Polly to a space tracking station in the Antarctic - and straight into trouble. A space mission is going badly wrong, and a new planet has appeared in the sky. Mondas, ancient fabled twin planet of Earth, has returned.

Soon the inhabitants of Mondas arrive at the Snowcap base. But although they used to be just like the humans of Earth, now they are very different. Devoid of emotions, their bodies replaced with plastic and steel, the Cybermen are here!

Humanity needs all the help it can get - but as the Cybermen take over, the Doctor is dying...