[post_page_title]Catherine Tate as Donna Noble[/post_page_title]
Donna Noble was only ever intended to appear on the show for a few episodes, but when the audience fell in love with the character the producers made her a permanent part of the cast. Donna’s role was working as the assistant to The Tenth Doctor. She played a huge role while on the show. Not only was Donna able to save the whole of reality from being overthrown by the Daleks, but she was also able to defeat their creator, Davros.