The Waters of Mars

David Tennant returns as the Doctor, joined by Lindsay Duncan and Peter O'Brien in the second special of 2009. It's Mars, 2059. Bowie Base One. Last recorded message: "Don't drink the water. Don't even touch it. Not one drop." The Doctor heads to a human settlement on Mars in 2059 and is met by the wary locals, but they're soon forced to trust him when they need his help to fight a terrible illness that is wreaking havoc throughout the colony. Guest-starring the acclaimed Lindsay Duncan, The Waters Of Mars is set to be one of the scariest Tennant episodes to date, as a creeping infection beneath the Martian surface threatens not only the human race, but also the Doctor's most fundamental beliefs - with terrifying results. Lindsay plays Adelaide - the Doctor's cleverest and most strong-minded companion yet. Neighbours and Casualty star Peter also guest-stars as Ed, Adelaide's second-in-command at the base. The Waters Of Mars is the second of four specials to screen throughout 2009.

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Patrick McLennan is a London-based journalist and documentary maker who has worked as a writer, sub-editor, digital editor and TV producer in the UK and New Zealand. His CV includes spells as a news producer at the BBC and TVNZ, as well as web editor for Time Inc UK. He has produced TV news and entertainment features on personalities as diverse as Nick Cave, Tom Hardy, Clive James, Jodie Marsh and Kevin Bacon and he co-produced and directed The Ponds, which has screened in UK cinemas, BBC Four and is currently available on Netflix.

An entertainment writer with a diverse taste in TV and film, he lists Seinfeld, The Sopranos, The Chase, The Thick of It and Detectorists among his favourite shows, but steers well clear of most sci-fi.