How I Met Your Mother
The Mermaid Theory still

S06E11

The Mermaid Theory

Aired December 6, 2010

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Summary

When Ted's new friendship with Zoey tests the theory that single men and married women can't be friends, he invites her husband, "The Captain," to hang out with them. Meanwhile, Marshall and Robin decide to spend alone time together, and Barney and Lily possibly have a fight.

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