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According to their website, whedonesque is featured in the second episode. Julie Benz plays "Darla" in this episode, as well as in the pilot episode.
The episode of Glee that featured a song by Ke$ha was 'Blame it on the Alcohol'.
The episode is called The Substitute. Gwyneth Paltrow was featured in that episode.
The song was "One Step Closer". It was featured in the ER episode "On the Beach."
Raven's birthday is featured in the episode "Birthmark".
Arizona came back from Malawi in season 7 episode 10.
iThink they kissed
The Little Kicks
It varies from episode to episode. The first person will tend to be who the episode featured the most or whom the episode was centered around.
siren song, season 5, episode 4
Frogger. Episode 174, "The Frogger."
This is Series 1, episode 4 in Amersham