This topic might have a better name.
Since Rita did not appear in this (or any other story), it has been clarified here that a story's name should not be used as a dab term.
Talk about it here.
Rita was a companion of the Eighth Doctor. She was mentioned by the Doctor as a past companion when he was near the end of his eighth incarnation. (AUDIO: Mary's Story)
|Companions of the Eighth Doctor|
|Original to television|
|Original to prose|
|Original to comics|
|Original to audio|
|Original to webcast|
|If a medium is not mentioned, then this incarnation did not have companions who were original to that medium; it does not mean that this Doctor failed to appear in that medium.|