How I Met Your Mother The Mermaid Theory (Season 6, Episode 11)
TV-PG
TV Episode | 30 min | Comedy, Drama, Romance

How I Met Your Mother

The Mermaid Theory (Season 6, Episode 11)

TV-PG

TV Episode | 30 min | Comedy, Drama, Romance

Ted goes on a boating trip with Zoey's husband, "The Captain." Meanwhile, Barney's "Mermaid Theory" prevents Marshal from having a nice dinner with Robin, and the narrator tries to recall the details of a fight between Lily and Barney.

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Cast	+ Add Cast
12 cast members

Name	Known for
Josh Radnor Ted Mosby Ted Mosby See fewer	Liberal Arts (2012)
Jason Segel Marshall Eriksen Marshall Eriksen See fewer	Forgetting Sarah Marshall (2008)
Cobie Smulders Robin Scherbatsky Robin Scherbatsky See fewer	The Avengers (I) (2012)
Neil Patrick Harris Barney Stinson Barney Stinson See fewer	A Series of Unfortunate Events (2017)
Alyson Hannigan Lily Aldrin Lily Aldrin See fewer	Buffy the Vampire Slayer (1997)
Kyle MacLachlan The Captain The Captain See fewer	Twin Peaks (2017)
Jennifer Morrison Zoey Zoey See fewer	House (2004)
Lyndsy Fonseca Daughter Daughter See fewer	Kick-Ass (2010)
David Henrie Son Son See fewer	Wizards Beyond Waverly Place (2024)
Tamara Lynn Davis Iris Iris See fewer	Once Upon a View (2015)
Angus McClelland Angus Angus See fewer	How I Met Your Mother (2005)
Bob Saget Narrator (voice) (uncredited) Narrator (voice) (uncredited) See fewer	Full House (1987)