Janet Fielding is probably best known for playing companion Tegan Jovanka to Peter Davison's Fifth Doctor. She's been diagnosed with cancer and, because Doctor Who really is like a big family, Davison is getting some folks to help out. Some big name folks, in fact.
In 2013, Doctor Who will be celebrating its 50th Anniversary, and we've always assumed that the big celebration would include as many former Time Lords from the past as showrunner Steven Moffat could possibly fit into the Big Blue Police Box. But one of those former Doctors doesn't think that's gonna happen.