Outgoing Doctor Who showrunner Steven Moffat and his predecessor Russell T. Davies joked about ending the recently concluded season ten with the cliffhanger of Missy becoming pregnant after sleeping with The Master.
Also featuring in the episode were two versions of classic Doctor Who villain, The Master.
Doctor Who season eleven is currently without a release date.
Despite killing each other, Missy and The Master had a sizzling chemistry which at times boiled over into sexual tension, with the episode even pulling out an erection joke.