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How I Met Your Mother/The Mermaid Theory
From The TV IV
| The Mermaid Theory | |
| Season 6, Episode 12 | |
| Airdate | December 6, 2010 |
| Production Number | 6ALH11 |
| Written by | Robia Rashid |
| Directed by | Pamela Fryman |
| Stream |  |
| ← 6x10 Blitzgiving |
6x12 → False Positive |
| How I Met Your Mother — Season Six | |
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The Mermaid Theory is the eleventh episode of the sixth season of How I Met Your Mother, and the one hundred twenty-third episode overall.
Starring: Josh Radnor (Ted Mosby), Jason Segel (Marshall Eriksen), Cobie Smulders (Robin Scherbatsky)
with Neil Patrick Harris (Barney Stinson)
and Alyson Hannigan (Lily Aldrin)
Special Guest Star: Kyle MacLachlan (The Captain)
Guest Starring: Jennifer Morrison (Zoey), Lyndsy Fonseca (Daughter), David Henrie (Son)
Co-Starring: Tamara Lynn Davis (Iris), Angus McClelland (Angus)
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