5. Episode 7 Will Be Set On Sarn
https://www.youtube.com/watch?v=JizK6y7Fjks Ever since location filming in Lanzarote was announced, this has been by far the biggest (and frankly the most plausible) Series 8 rumour to hit the internet. Because 1984s Planet Of Fire was filmed in Lanzarote where it doubled for the planet Sarn, and Episode 7 is one that will see the Doctor return to the scene of an old adventure, Classic Who fans have been putting two and two together and getting a Planet Of Fire sequel. The Doctor finding sinister changes at the scene of the old adventure would work for Sarn since it was a planet that produced medicinal gases and suffered a series of volcanic eruptions at the climax of Planet Of Fire. And of the many things that could cause sinister changes to a planet, massive volcanic eruptions are certainly a biggie. Just what the Doctor is doing there is unknown but judging by the spacesuits and the presence of Hermione Norriss character, its definitely not a bucket and spade holiday. If the planet is Sarn then a possibility for them being there is some kind of geology expedition, or an attempt to mine the last of the planet's healing Numismaton gas. Theres not much to go on but if it is true, there will be some very happy fanboys out there in nine weeks time.