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episode title: Auld Acquaintance

Air date: 2012-04-21

episode lenght: 22 minutes

The team finally learns the identity of the traitor in their midst, forcing a battle against an enemy more dangerous than any theyve ever faced before! (source imdb)

IMDB rating: 9.6

This exact episode (1/26): imdb number tt2087629

Lacey Chabert => imdb link: nm0000327
Crispin Freeman => imdb link: nm0293342
kittie KaBoom => imdb link: nm1717849
Stephanie Lemelin => imdb link: nm1107254
Jesse McCartney => imdb link: nm0565366
Danica McKellar => imdb link: nm0005211
Nolan North => imdb link: nm0636046
Khary Payton => imdb link: nm1146051
Jason Spisak => imdb link: nm1032853
Thom Adcox-Hernandez => imdb link: nm0011609
Jeff Bennett => imdb link: nm0071818
Oded Fehr => imdb link: nm0004912
Miguel Ferrer => imdb link: nm0001208
Bruce Greenwood => imdb link: nm0339304
Vanessa Marshall => imdb link: nm0551223
Chad Lowe => imdb link: nm0005165
Kevin Michael Richardson => imdb link: nm0724656

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