Houdini & Doyle (2016)

S6E11 The Mermaid Theory

Title: The Mermaid Theory Plot: Ted's burgeoning friendship with Zoey challenges the notion that single men and married women can’t maintain platonic relationships, leading him to invite her husband, known as "The Captain," to join their outings. Concurrently, Marshall and Robin opt for some quality time alone, while Barney and Lily find themselves in a potential disagreement.