The BBC have announced that the next hour long episode will be shown on Sunday November 15th at 7.00pm.
Called "Waters of Mars" in says it will be the 'darkest' episode yet.
In the story the Doctor will be joined by a new companion named Adelaide, played by Lindsay Duncan, who is head of Mars base. Producer Nikki Wilson described the character as "the Doctor's cleverest and most strong-minded companion yet." The most recent trailer shows a massive terrarium of life on the planet's surface, and a mysterious alien which infects its victims using a water compound it creates.


