Missy's child
From Tardis Wiki, the free Doctor Who reference
At some point, Missy had a child. When she gleefully presented the baby to three of her previous incarnations they reacted with shock. (PROSE: Winning)
She almost revealed the child's existence to Clara Oswald while in the Dalek Sewers, revealing the child to be her daughter.(TV: The Witch's Familiar)
Behind the scenes
This illustration arose because of a conversation between Steven Moffat and Russell T Davies. The joke plan follows that Moffat would have ended his era of Doctor Who on a cliffhanger in which Missy told the Saxon Master and the Twelfth Doctor that she was pregnant.[1]
