The door marked Playtime

You doubt you’d survive outside the Tardis for long, so you crawl towards the door that leads to the dungeons, wondering if that’s just where Missy wants you to go, as you hear her loudly say the word ‘Ten’.

Her counting continues through the remaining numbers, as you struggle once again to get up, and as she reaches one you finally have lift-off, and lurch through the door.

You hear her voice behind you just before you close the door, “Coming, ready or not.”

You find yourself at the start of a seemingly infinite corridor, lined with doors, each with their own ornate signs. The door on the left of you says Mistress Clara, while the door on the right says Madame Vastra.