Next week's Doctor Who finale 'The Name of the Doctor' has been leaked.
The episode is featured on the Series 7 Part 2 Blu-ray release, which was accidentally dispatched early to fans in the US over the weekend.
It emerged earlier today (May 12) that fans who had pre-ordered the boxset in the US had received the Blu-ray before the final two episodes of the current series had been transmitted.
Edward Russell, the BBC Brand Manager for Doctor Who, tweeted about the incident and urged those who had received the episodes to not spoil other fans.
He posted: "Production error in US means DW bluray shipped early. Let's hope no one spoils it for those who want to enjoy it together on Sat. Please RT."
The show's official Twitter account has also posted a message concerning the leak. They too urged fans to consider the enjoyment of others before posting spoilers.
They tweeted: "Some US DVDs of this series have gone out early. The #DoctorWho team would be hugely grateful if fans helped keep spoilers off the net."
They continued: "Steven Moffat has promised if fans help keep the finale's secrets, we'll release a special video featuring Matt & David right after the ep!"
A three-minute prequel for 'The Name of the Doctor' was released by the BBC following the conclusion of last night's episode 'Nightmare in Silver'. It features the Doctor (Matt Smith) and Clara (Jenna Louise Coleman) admitting how little they know of each other.
Executive producer Steven Moffat has teased the finale episode, saying that the episode will "change the course of Who forever".
It is thought that the episode will directly lead in to the 50th anniversary special episode, which is scheduled to air on November 23.