This episode goes behind the scenes of The Waters of Mars

It is the beginning of the end for David Tennant's Doctor, and Confidential is on a mission to Mars to capture the strange goings-on in Bowie Base One. The programme goes behind the mask of the monsters as the waters rise, causing the production team a variety of problems. There are explosions, robots and gallons of water as the Doctor meets one of his heroes and battles against his greatest foe - time itself.