K.J. Yossman She’s perhaps best known for her turn as David Tennant’s companion Donna in “Doctor Who” (a role she’ll reprise on screen this fall) but, for her latest project, Catherine Tate has swapped the Tardis for tiaras. Titled “Queen of Oz,” the new BBC comedy sees Tate play a disgraced British princess who is sent Down Under after screwing up one too many royal engagements. In the show, Tate plays Princess Georgiana who, after yet another public catastrophe (involving a school visit and plenty of alcohol-induced vomit), is banished to Australia. Tate says she was attracted by the “fish out of water” concept but, despite many royal-related headlines in recent years, is keen to point out that no real royals inspired Georgiana’s character. “I wasn’t thinking of anyone, because it’s nice to create something from scratch,” says the comedian, who co-wrote and stars in the series.