Sean Pertwee

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

He has frequently been asked if he would play the role of the Third Doctor if asked (as a tribute to his father), but has said that the character was his father's and that he wants to keep it that way. Despite this, he once posted a photograph of himself dressed as the Third Doctor on social media.