TV’s longest-running science fiction series is revamping again, with a four-part farewell to David Tennant as the latest and greatest Doctor on Doctor Who.

Tennant is the tenth Doctor for the BBC series, which is a phenomenal success in Canada (where it airs on Space), but it is only coming this season to BBC America, much to American fans’ delight.

The second special of the four-parter, The Waters of Mars, is written by award-winning Russell T Davis (Torchwood, Queer as Folk), and spins the classic series into a universal travel to protect the earth one last time before the show invigorates with a new season, new writer (Steven Moffat) and new Doctor, played by Matt Smith.

Hopefully Smith can fill the massive shoes left behind by Tennant, whom Davis can do nothing but rave over to TV critics. “He dances over the dialogue,” the writer gushed. “He gets the humour and the comedy, and not many actors do that. I like that lighter stuff, no matter how dark and to the edge [the show] gets.”

It’s a bittersweet farewell for Tennant, who isn’t quite sure how to express his emotions about his final romp on the show. “It’s so many things,” he offers. “It’s very exciting but also very sad. It’s thrilling to be handing over the show in such good health. We’ve all sort of come on this journey together and it feels like we’re coming to the end of something special. We’re clinging on it now until the show’s all done.”

The Waters of Mars comes to international TV screens this fall, with the final two specials airing in late 2009 and early 2010.

Amber is currently reporting live from the TV Critics Press Tour in L.A. Check out complete coverage here. amber@tvguide.ca

Have a TV question? Check out the latest Ask Amber, or follow Amber on Twitter.

BACK TO THE TCA CALENDAR

Follow TV Guide Canada on Facebook