Original: A secretary from Chiswick , London , she is a companion of the Tenth Doctor , appearing in one scene at the end of the final episode of the 2006 series , '' Doomsday '' , leading into the programme 's second Christmas special , '' The Runaway Bride '' .
Simplified: She appears in one scene at the end of the last episode of the 2006 series , '' Doomsday '' ( named in the credits only as '' The Bride '' ) , and in the second Christmas special , '' The Runaway Bride '' .