Much like its hero, "Spider-Man: Into the Spider-Verse" swings wildly from place to place, in a tone that's so uneven as to initially be a trifle disorienting. Stick with it, though, and this animated feature -- distinguished by its dazzling visual palette, which creates the feel of a comic book leaping onto the screen -- proves a great deal of fun, reinforcing that animation remains the ideal medium (if not the most profitable) for superhero adaptations.