Disney and Marvel pull off a friendly merger, a team retreat and a shocking spinoff in the perfectly adequate but unremarkable Avengers: Infinity War (C+) directed by Anthony and Joe Russo. The Avengers team of superheroes works with the Guardians of the Galaxy in an attempt to thwart baddie Thanos (a solid Josh Brolin under all those prosthetics) from amassing all the Infinity Stones. There’s fun banter of one-upmanship between Chris Hemsworth’s Thor and Chris Pratt’s Starlord and a solid running joke about Rocket Racoon’s species, but the plot and action sequences are a long uneven slog. Many characters are missing in action. We get far too little Black Panther, for instance. It all feels more like corporate synergy than sensational.