“The Mermaid Theory” is a pretty wacky episode. There are a bunch of sight gags, my favorite being the manatee costumes, running jokes about the “mermaid theory”–women turning into mermaids from manatees after a while, turning back if pregnant, and again turning back if breastfeeding–and Future Ted totally mixing up a future story, teased by Ted in a dress, and the present story. The episode doesn’t really touch on any sweet or emotional points, but is altogether a pleasant, funny episode.
As far as plot goes, there’s not much going on between Marshall and Robin having dinner and Barney and Lily fighting. Ted goes on a boat trip with the Captain, and defying Ted’s expectations, the Captain does not kill him. We do get some movement between Zoe, who is a lot more likable when not protesting, and Ted. They agree to be just friends and that they don’t have feelings for each other… right.
Tags: How I Met Your Mother, Neil Patrick Harris