Sean Pertwee

 is the son of the actor who played Third Doctor, Jon Pertwee. He cameod as himself in the 50th anniversary story The Five(ish) Doctors Reboot.

He has been asked many times whether or not he would play the role of the Third Doctor if asked (as a tribute to his father), but Sean has said that the character was his father's and that he wants to keep it that way. However, in November 2014, Sean dressed up as his father's iconic character for a Halloween costume.