The creator of Doctor Who is mocking fans who are curious about David Tennant's impending return.

Anything is possible in the world of Doctor Who. People die and resurrect,

doppelgängers exist across time, The Doctor regenerates, and so on.

One of the biggest casting rumours was confirmed 

not long after the historic announcement of Ncuti Gatwa being cast as the Fourteenth Doctor.

David Tennant and Catherine Tate, who played the Doctor's trusty companion Donna Noble,

 will return to Doctor Who, but the showrunner has hinted that they may not be reprising their roles.