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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Episode Details: How I Met Your Mother Season 6 Episode 11
| Title | The Mermaid Theory |
| Episode | 11 |
| Season | 6 |
| Release | December 6, 2010 |
| Overview | 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. |
| Rating | 7.5 |
| Vote Count | 24 |
