Agnes Brown

Agnes Brown attended a Christmas party with the Eleventh Doctor, Amy Pond, and a host of other BBC stars. (NOTVALID: Consider Yourself One Of Us...)

Another Christmas, at the BBC Wales studio, Agnes entered the Doctor's TARDIS, mistaking it for a dressing room that she hoped would be "bigger than it [looked]", before it dematerialised, taking her with it. (NOTVALID: It's Showtime)

Behind the scenes
Agnes is the titular character of the BBC sitcom, Mrs. Brown's Boys.