Missy had a Cybermen army when she first met the Twelfth Doctor in “Dark Water,” too. Brilliantly, the Saxon Master and Missy later worked together and reigned over yet another Cyber army in ...

Indeed the Fifth Doctor's last spoken word was ‘Adric’. The return of the Cybermen to the series, their first appearance since Revenge of the Cybermen in 1975, was a well-kept secret.