“What the hell is going on?!” splutters Samuel L. Jackson’s Nick Fury early on in The Marvels. It’s a sentiment certain to be shared by more than one audience member during Nia DaCosta’s film, a follow-up to 2019’s Captain Marvel (by way of Disney+ TV series WandaVision and Ms. Marvel) that struggles to stay coherent for a good deal of its relatively brief running time.