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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)
Behind the Scenes