TWO Doctor Who stars have joined the fight to have the 50th Anniversary episode filmed in Australia.

Katy Manning, who played Jo Grant, the companion to The Doctor circa John Pertwee in the 1970s, and Terry Molloy, who played evil genius and creator of the Daleks, Davros, in the 1980s, have written letters to Australian MP George Christensen supporting his bid to have an episode of Doctor Who filmed in Australia.

Their letters of support follow in the wake of an official campaign launched by Mr Christensen in October to have the episode filmed in the Whitsundays on January 12, 2015 - coinciding with the first Aussie screening of Doctor Who.

Manning - who became an Australian citizen in the late 80s and who recently reprised her role as Jo Grant opposite Matt Smith in a special episode of Doctor Who spin off The Sarah-Jane Adventures - wrote that she "couldn't think of a better location than the Whitsundays" for an anniversary episode to be filmed.

"Given the long history that Doctor Who has with Australia - both in contributions to content and support base, I believe an Australian special to go to air on or around 12 of January 2015 would be a fitting way to mark this special occasion," she wrote.

Mr Christensen said that Manning also suggested that a whole series be filmed in Australia.

"If they did a whole series, I think we could definitely jag one episode to be filmed in Bowen and the picturesque Whitsundays. Our friends across the ditch could even get one filmed by Peter Jackson," he said.

Molloy chose to be more blunt in his show of support for an Aussie Doctor Who episode, simply writing "Bring Doctor Who to the Whitsundays!" on a picture of his mean-looking character, Davros.

Mr Christensen told news.com.au he hoped the BBC took note of what Davros had to say "or otherwise he might get a legion of Daleks on to him".

Mr Christensen will be sending cards showing the Doctor's TARDIS spacecraft to celebrities all over Australia to encourage them to throw their support behind his campaign.

Fans can also download and fill out the petition at Doctorwhodownunder.com.au.