Doc 'n' roll.
The hit show, filmed in Wales, was back for its fourth series - and as this shot shows, right, relationships between the two are feisty, with mouthy Donna not one to be pushed around.
David Tennant, who plays the Doctor, said he doesn't mind not having a romantic connection with his latest on-screen companion.
He said: "It's sort of the next thing to do. We've had a love story, we've had an unrequited love story, why not have this. They do love each other, just platonically."
WHO'S TALKING?: Donna and Doctor; WHO'S THAT? Stella Street star Phil Cornwall in an upcoming episode