The BBC have released the synopsis for episode 11, "The God Complex". Written by Toby Whithouse ("Vampires of Venice" and "School Reunion"), the episode stars David Walliams as "Gibbis":
The TARDIS lands in what looks like an ordinary hotel, as the time-travelling drama continues. But the walls move, corridors twist and rooms vanish. There is a room for every visitor that contains their deepest, darkest fears. Fears that will kill them. What lies in the Doctor's room? And when his turn comes, will he welcome death like all the rest?
The Doctor is played by Matt Smith, Amy by Karen Gillan, Rory by Arthur Darvill and Gibbis by David Walliams.
"The God Complex" will air on BBC1 on Saturday 17 September 2011.