Five scripts for the new series of Doctor Who have leaked online, almost two months before the episodes are due to be broadcast.
It's thought that there was a security breach where the unfinished scripts were made public by accident.
BBC bosses have said they're really sorry and are pleading with fans not to share the spoilers.
Series eight - the first with Peter Capaldi playing the Doctor - is due to hit our screens on 23 August.
BBC Worldwide say they're looking into what happened. A statement said: "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."