The BBC has released some stills of the next installment of Doctor Who along with a trailer, giving us some tantalising hints as to what's in store for us on Saturday.
Dubbed The Caretaker, the episode sees The Doctor (Peter Capaldi) pose as a janitor at Coal Hill School, where Clara (Jenna Coleman) works as a teacher.
It's also where Clara's love interest, Danny Pink (Samuel Anderson), teaches.
The photos see The Doctor posing outside the entrance to the school pressing his watch and playing with his Sonic Screwdriver.
According to the official synopsis: "The terrifying Skovox Blitzer is ready to destroy all humanity – but worse, and any second now, Danny Pink and The Doctor are going to meet.
"When terrifying events threaten Coal Hill School, The Doctor decides to go undercover."
The episode was written by Garth Roberts and Steven Moffat and was directed by Paul Murphy.
Because of the start of the new series of 'Strictly Come Dancing', this Saturday's 'Doctor Who' will air at 8:30pm instead of 7:30, on BBC One.