In the 17th century, a man is putting flowers on the grave of his wife with his daughter Cinderella. Behind the bushes, a time lady is seen regenerating. She approaches and entices them both. Fast forward to week later, the time lady approaches his bed and sings "don't wanna close my eyes, I don't wanna fall asleep, cause I'd miss you babe, and I don't wanna miss a thing"
They marry and live happily everafter. That is, until the time lady discovers an old watch in the man's possessions, wakes up and crosses her own timestream. With a boat. She gives herself the watch as a wedding gift, and the next day Cinderella is in the cellar, building a paradox machine.
On the girl's 19th birthday, a blue box appears inside the cellar, but her evil step-mother drags her out. A woman walks out of the the blue box, and the time lady begins singing "dude looks like a lady". She ties her, using the chameleon circuit turns the box into a pumpkin and the Zygon companions into mice, and appoints her daughter to feed them.
"Missus, if you could help me free you, can you help me, please?"
"Damn it man, I am the Doctor, not a fairy!"
"Doctor who?"
"Doctor, doctor, doctor, please, doctor, doctor, please"
The step-mother rushes in...
"Come on, help her, Doctor. Let us see what you can do now after your carriage has been turned into a pumpkin. You have your magic wand, don't you." [laughs]
"Well... I used to... Wait, did you say carriage?"
With the new insight, the Doctor secretly gets the pumpkin-carriage business going, and even though chameleon circuit buckles and resets itself at midnight each day, Cinderella falls in love with the prince, loses her shoes, marries him, the whole routine. But they never realise that the step-mother is... (wait for it)
THE MASTER [thunder sounds]
"...MASTER, MASTER, MASTER OF PUPPETS"
"Hey, shut up, this is not our song"
They fight THE MASTER [thunder sounds] and kill her, bury her, the credits roll and Aerosmith covering Faith of the Heart begins.
"Stop it!" the grave screams in a female voice. "Please stop it, I might be dead, but that does not make it any less terrifying! Oh Doctor, I am so walking out of that grave and coming for you! DID YOU HEAR ME, DOCTOR? I AM COMING FOR YOU! It is going to be your death one day, you keep forgetting the second rule - never provoke THE MASTER [thunder sounds]"
"Oh, stop that noise in there," the annoyed Doctor complains. "Can you please shut up and stay dead?"
"Doctor, I am your mother!"
A policeman comes in and arrests the Doctor and the grave for the silly sketch.