The Doctor also tells her that she will easily be able to break out of the prison whenever she wishes, and explains that the diary he gave her in " Let's Kill Hitler" is to help keep track of their encounters. The Doctor informs her that her parents, Amy and Rory, are asleep and he is taking her out to Calderon Beta where he intends to show her the sky on the starriest night in the entire history of the universe. River Song ( Alex Kingston) is incarcerated in her cell on the first night after apparently killing the Doctor (" The Wedding of River Song") when she hears the TARDIS. When she finishes the anecdote, the Doctor is by the doors, ready to go with her to the fair. While recalling the event, she suddenly remembers a woman with red hair, dressed in a nightie, who gave her a new ice cream.
It was at a fair when she dropped an ice cream. The Doctor comforts her and reminds her of the saddest moment of her life. Due to the events of " The Big Bang", she can remember two versions of her life, one without her parents and one with. She convinces him to tell her what he does while he's out at night, then tells him why she is finding it hard to sleep lately because her life doesn't make any sense. Amy, wide awake and sitting in her nightie on the stairs, catches him. The Doctor returns from another night out with River Song.
She wants to have a serious conversation with the Doctor about her uneasy sleep, but the Doctor calls for her husband Rory ( Arthur Darvill) to come deal with her emotions when he realises that he picked up the wrong goldfish. Amy tries to piece together how the fate of the Commonwealth could possibly be affected by the Doctor, an unseen River Song, an unnamed Prince of Wales and the goldfish. The Doctor ( Matt Smith) then enters the TARDIS carrying a goldfish, whom he claims is actually a British Queen. When Amy Pond ( Karen Gillan) answers the TARDIS telephone in the middle of the night, she learns the Doctor carries on a very active social and adventuring life while his companions sleep.