The realm of dreams is described as “a world with no consequence,” but as constructed, that comes in a movie with no clear creative compass, proving more mystifying than magical.

The biggest problem with Slumberland is its utter innocuousness.

Ms. Barkley comes across as a kid rather than a studio creation. Mr. Momoa gives the kind of unhinged performance of which few would have thought him capable. His prancing about at moments of joy are, in fact, joyous.

Comics and films in McCay’s day were brand new media bursting with possibility. They promised to bring our dreams to life, and that’s what Slumberland delivers.