The Doctor forgets to set the TARDIS controls leaving Amy trapped inside as she ends up travelling one week into the future, without the Doctor. This leaves the Doctor trapped on Earth as he awaits the return of his TARDIS.
There's a house on Aickman road with a staircase that people go up, but never down... To solve the mystery of the man upstairs, the Doctor must pass himself off as a normal human being, and share a flat with Craig Owens