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" (named in the credits only as "The Bride"), and in the 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".