The TARDIS brings the Doctor and his friends to a space tracking base in the Antarctic – and straight into trouble. A space mission is going badly wrong, and a new planet has appeared in the sky. This novel is based on the final story to feature the First Doctor, which was originally broadcast from 8 to 29 October 1966. This was the first Doctor Who story to feature the Cybermen. Featuring the First Doctor in his very last adventure as played by William Hartnell, and his companions Ben and Polly.