Donna’s grandad Wilf Mott is in reality veteran actor Bernard Cribbins, a man who has appeared in some of the favourite British shows and movies over the last 40-odd years.
And he’s just revealed that he auditioned for Doctor Who back in 1974, for the role of the Fourth Doctor!
Of course the role went to Tom Baker at the time, and Cribbins was a well-known face at that time – his presence in the lead role could have sent the series in a startlingly different direction.
"When Jon Pertwee was leaving I went to be interviewed with a view to perhaps playing Doctor Who. I would have loved to have done it, I must say.
"We concluded the interview and I went home and didn’t get the job, obviously. Tom Baker got it."
The 79-year-old is known to fans of the franchise for his role as Special Constable Tom Campbell in 1966 film Daleks – Invasion Earth 2150 AD.
There’s a story he could tell his grandkids – oh that might get confusing…