The Marvel Cinematic Universe is now big enough to include the Great American Sitcom. The blockbuster movie franchise is taking some of its stars to the small screen, starting with Disney+’s “WandaVision” (first two episodes streaming Friday, then weekly, ★★½ out of four), a messy but pleasantly silly superhero sitcom starring Elizabeth Olsen and Paul Bettany as “Avengers” heroes Wanda Maximoff/Scarlet Witch and Vision.

It’s the first live-action Marvel series made for Disney+, a more A-list and heavily promoted outing than the handful of shows with lesser-known film heroes that have populated series on ABC, Freeform, Hulu and Netflix since Marvel first dipped into TV with ABC’s “Agents of S.H.I.E.L.D.” in 2013. It also more directly relates to the Marvel movies, akin to required summer reading for comic book devotees. (The stars of “WandaVision” have hyped it as a necessary watch before the upcoming “Doctor Strange” film.)

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