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episode title: Underneath

Air date: 2004-04-14

episode lenght: 42 minutes

Angel, Spike and Gunn travel to a surprisingly unusual hell dimension to free Lindsey and find out what he knows of the Senior Partners ultimate plans. With Illyrias army defunct and her plans averted, the gang accepts her as a dubious ally. Wesley, volunteering to be her guide and mentor, falls slowly into depression and self-destruction. Meanwhile, the Senior Partners send a new, unstoppable force, a new liaison and businessman, named Marcus Hamilton, to find Eve, and Gunn makes an important decision in an attempt to protect his friends... and save his soul.::TheGreenSaga (source imdb)

IMDB rating: 8.4

This exact episode (5/17): imdb number tt512924

David Boreanaz => imdb link: nm0004770
James Marsters => imdb link: nm0551346
J. August Richards => imdb link: nm0724124
Amy Acker => imdb link: nm0009918
Andy Hallett => imdb link: nm0356468
Mercedes McNab => imdb link: nm0573523
Alexis Denisof => imdb link: nm0219206
Christian Kane => imdb link: nm0437283
Sarah Thompson => imdb link: nm0860688
Adam Baldwin => imdb link: nm0000284
Nicholl Hiren => imdb link: nm1060710
Christian Boewe => imdb link: nm0091444
Jared Poe => imdb link: nm1248910
Brian Reed Garvin => imdb link: nm1503505

Most of the info found on this page was found on imdb