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How I Met Your Mother/Mosbius Designs

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Mosbius Designs
Season 4, Episode 20
Airdate April 13, 2009
Production Number 4ALH20
Writer(s) Kourtney Kang
Director(s) Pamela Fryman
← 4x19
4x21 →
The Three Days Rule
How I Met Your MotherSeason Four
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Mosbius Designs is the twentieth episode of the fourth season of How I Met Your Mother, and the eighty-fourth 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)

Guest Starring: Ryan Sypek (PJ)

Co-Starring: Bo Barrett (Guy 2), Edward Flores (Food Guy), Stephen Holland (Creepy Back Rub Guy), Darren O'Hare (Guy 1), Adrian Rice (Fantasy Guy), Joel Spence (Toy Guy)


Plot Overview


Arc Advancement





The Show

Behind the Scenes

Memorable Moments