He appears in the first episode of the third series.

She only appears in the final episode of the show.

She appears in almost every episode of series one, two and three.

He did not appear in two episodes of the show as a result.

She has appeared in four episodes of the show between 2008 and 2009.

During the third season, his music appeared in seven episodes.

As of 3 May 2013, he has appeared in 101 episodes.

He appeared in only four episodes of the final season.

During the 2009 second season of 90210 she appeared in six episodes.

He has appeared in more than 100 episodes since then.