The BBC has apologised and pleaded with fans not to reveal details after five scripts for 'Doctor Who' series eight leaked online.
"BBC Worldwide is currently investigating a security issue around 'Doctor Who' series eight where unfinished material has inadvertently been made public," the corporation told Radio Times.
"We deeply regret this and apologise to all the show's fans, the BBC and the cast and crew who have worked tirelessly making the series.
"We would like to make a plea to anyone who might have any of this material and spoilers associated with it not to share it with a wider audience so that everyone can enjoy the show as it should be seen when it launches.
"We know only too well that 'Doctor Who' fans are the best in the world and we thank them for their help with this and their continued loyalty."
It's thought the scripts leaked after being sent to BBC Worldwide's Latin America headquarters in Miami to be translated.
The eighth series starts on August 23. The BBC also released a new trailer for the series, which hints that the Daleks might make a return, along with the Cybermen.