"Desperation Day"

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.

  • 4.5 / 5.0
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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.

  • 5.0 / 5.0
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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.

  • 4.8 / 5.0
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Marshall and Lily visit a doctor on the first episode of 2011. They want to move the pregnancy process along.

  • 5.0 / 5.0
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"False Positive"

Marshall and Lily discover shocking news on this episode, the final one before a holiday break. Elsewhere, Robin gets a new job.

  • 5.0 / 5.0
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"The Mermaid Theory"

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.

  • 4.8 / 5.0
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Ted prepares a Thanksgiving feast for the gang this week. Former Lost star Jorge Garcia makes an appearance.

  • 2.8 / 5.0
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It's the return of Robin Sparkles! Viewers enjoy more of this alter-ego after Barney finds a copy of the show Space Teens.

  • 4.0 / 5.0
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"Natural History"

A fundraiser at the Natural History Museum is the focus of this week's episode. Aptly, the half hour is titled "Natural History."

  • 4.0 / 5.0
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"Canning Randy"

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.

  • 3.0 / 5.0
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