David Tennant's next Dr. Who outing is in the special 'Waters of Mars' which will be screened later this Autumn on BBC 1.
The Dr will team up with a feisty female character called Adelaide (played by Lindsay Duncan who starred in BBC2's recent Margaret Thatcher biopic) who is furious when he shows up without an invitation at a base on Mars she is heading.
They both battle a disgusting looking creature called Andy Stone (played by Alan Ruscoe) who has freaky eyes, black lips and a cracked face and also sports the ability to control water, infecting others to become like him.
You can see more in the preview clip and the trailer below... Tennant's time is also up. The Master is coming back to finish the job he started!