David Tennant and Catherine Tate return to Doctor Who

One of the best loved pairings in Doctor Who's history are reuniting and are currently filming scenes due to air in 2023 to coincide with the show's 60th anniversary celebrations.

The Doctor and Donna parted ways when the Doctor had to wipe Donna's memory, making her forget him, in order to save her life. He left her family with a warning: if ever she remembers, she will die. But with the two coming face to face once more, the big question is, just what brings the Doctor and Donna back together?