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Barney comes up with a name for February 13 on this episode: Desperation Day. While he honors lonely women, Marshall is shocked by Lily's gift for him.
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.
The gang goes to Minnesota with Marshall this week in order to bury his father. But things take an interesting turn when this character runs into a former bully.
Marshall and Lily visit a doctor on the first episode of 2011. They want to move the pregnancy process along.
Marshall and Lily discover shocking news on this episode, the final one before a holiday break. Elsewhere, Robin gets a new job.
Can men and women be friends? Ted and Zoey set out to test that question on this episode, which involves time spent with The Captain.
Ted prepares a Thanksgiving feast for the gang this week. Former Lost star Jorge Garcia makes an appearance.
It's the return of Robin Sparkles! Viewers enjoy more of this alter-ego after Barney finds a copy of the show Space Teens.
A fundraiser at the Natural History Museum is the focus of this week's episode. Aptly, the half hour is titled "Natural History."
Zoey signs up for Ted's class this week and gets his students on her side of the fight to save a hotel from being torn down. In another storline, Marshall and Lily spy Robin in a Halloween parade.
