Super Smash Bros. might be a Nintendo flagship, but it's Sony's movie business that wants to bring it to the big screen.
A Super Smash Bros. movie is referenced several times in documents published by Wikileaks following the huge Sony Pictures leak.
ArsTechnica dug out these interesting snippets, discovering that Sony made a "full court press" to secure the Smash Bros. rights. Sony seem to be working with producer Avi Arad, who had been wooing a Nintendo contact for several years, to this end.
Elsewhere in the documents, a reference to a "five year chase" suggests Arad and Sony have been trying to secure rights to Mario, Zelda, and Donkey Kong for quite some time, either for Smash Bros. or independent projects. Arad is also trying to get a Pokemon movie off the ground, apparently.
If this all seems a bit odd to you, remember that Sony Pictures is totally independent of Sony Computer Entertainment, both of which answer to the main corporate body, which has traditionally focused on consumer electronics and wholesale components. It's only in the last few years, as other business have wound down and PlayStation has exploded, that the games has begun to infiltrate Sony corporate culture.
Plus, promoting video games in the mainstream is good for everyone in the industry, regardless of whose IP is in the limelight, so SCE would see knock-on effects, too.
One top of that, a good Smash Bros. movie would be awesome, and everyone owes it to the world to try and make it happen. Nintendo has licensed its characters and likenesses to films before, as in Wreck-It Ralph and Pixels, so it's not inconceivable.
There was quite a bit of gaming movie news in the leak, apparently; we got a lot of intel on the Uncharted movie, and Ars said there are mentions of BioShock, Metal Gear Solid, Gran Turismo and Sonic the Hedgehog.