The BBC has apologised and promised to investigate after scripts for five Dr Who episodes were leaked to the web.
The batch reportedly includes the script for the first episode of the upcoming series, Deep Breath.
The BBC has confirmed the leak and promised to investigate.
"BBC Worldwide is currently investigating a security issue around Doctor Who Series 8 where unfinished material has inadvertently been made public," it said in a statement.
"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."
The upcoming series stars Peter Capaldi as the Doctor. The Daily Mirror reports that what appeared to be the cover for 'Deep Breath' had been posted to the pop culture website bleedingcool.com.
