Despite plenty of cameos in The Super Mario Galaxy Movie, an Avengers-style Super Smash Bros. film isn't likely right now

Despite crossover characters such as Fox McCloud appearing in The Super Mario Galaxy Movie, that doesn't mean we should expect something akin to a Super Smash Bros. film any time soon.

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source https://www.eurogamer.net/despite-plenty-of-cameos-in-the-super-mario-galaxy-movie-an-avengers-style-super-smash-bros-film-isnt-likely-right-now