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Katy Perry guest stars on this episode of How I Met Your Mother. The singer comes on board as a woman who gets Barney to open up.
A lottery winner is killed in brutal fashion this week, resulting in a number of suspects. In related news, Martha inherits money she thinks she doesn't deserve.
Navid learns some major news about Adrianna and her adoption this week. Teddy, meanwhile, gets surprised by who is blackmailing him.
Blair enlists Nate's help to win over her boss. Damien stirs up more drama on the Upper East Side. Chuck finds himself torn between business and pleasure.
We're on to a new chapter in the lore of Chuck. During this episode, Chuck and Sarah are set to Morocco to rescue Roan Montgomery.
Cuddy's mother returns this week, but for a dangerous reason. She falls sick and House goes to extreme lengths to save her.
Greek tackles a controversial, interesting topic this week. Pregnancy and the morning-after pill are at the center of "Fumble."
Brad Womack culls the field of Bachelorettes down to six. Will our fan favorites survive? Will he finally get rid of the girls we don't even recognize?
Josh meets a fellow werewolf this week. Elsewhere, Aidan gets into a co-dependent relationship with Rebecca.
Cadie is the focus of this episode. The character tries to come to terms with her eating disorder.