Just as “Nuking the Fridge” has become shorthand for introducing unwanted material in a beloved franchise (courtesy of Indiana Jones and the Kingdom of the Crystal Skull) – “Waving the Baby” may enter the lexicon thanks to The Flash. You’ll see what I mean in the opening scene of the DCEU adventure. There’s shoddy visual effects accompanying the term that may produce unintended laughter. That said, I kind of warmed up to this initial action sequence with Ezra Miller’s title character given a save the day assignment from Alfred the Butler (Jeremy Irons, reprising his role from Batman v Superman: Dawn of Justice and Justice League). Like much of the first half, it’s light and quirky and (despite their offscreen troubles) Miller shines in a dual role. There’s genuine moments of intended laughter too. The second half is where this becomes overbaked and the frequent surprise cameos don’t save it. It’s a countdown to continued mediocrity after a sturdy start.

The Flash’s alter ego is Barry Allen and he’s assisting Ben Affleck’s version of the Caped Crusader (and others) as we begin. He’s doing a bit of the grunt work while his Justice League teammates handle cooler assignments. Barry’s mom (Maribel Verdú) was murdered when he was a youngster. His dad (Ron Livingston) was wrongly convicted of the crime and is imprisoned with an appeal on deck. The possibility of time travel is introduced giving Barry a potential green light to undo the childhood trauma and save his family. We know through countless features that going back to alter the future never works as intended. By the way, there’s some enjoyable reference to Back to the Future and additional 80s classics.

Before we know it, Barry/The Flash is stuck in a multiverse situation with a younger and not as scientifically gifted version of himself. In this world, Affleck doesn’t don the Batsuit. Instead we are given the chance to witness Michael Keaton back in the role for the first time in over 30 years. His Bruce Wayne is long out of the limelight, but the Barry’s visit to his Manor might get him to repeat iconic line readings once again.

There’s less memorable character reappearances in the alternate reality. Michael Shannon reprises his turn as General Zod from Man of Steel as does Antje Traue as his second-in-command. If you weren’t clamoring for that bad guy’s comeback, I get it. He was a weak nemesis a decade ago and he is again. This isn’t really Shannon’s fault, who’s a gifted performer in plenty of other films. He simply doesn’t have much of a role to flesh out. If comic book movies are as solid as the villains, The Flash is offtrack.

Of course, weak villains have been a staple of the DCEU and MCU and other factors often rescue them. For awhile, that’s the situation. Miller excels with the comedic timing and dramatic beats. Given that the initial hour plus focuses on the older and socially awkward Barry teaching dumber but happier Barry how to become a superhero, there’s plenty of entertainment value. Then it goes and clocks in at nearly two and half hours. Keaton’s return is welcome at first. Gimmicky? Sure. Sasha Calle’s debut as Supergirl is underwritten though her performance is promising if she’s given screen time in future entries.

The latter portions of The Flash are interchangeable from about every other genre experience. We’re talking loud, messy, and dull battles. By then, it doesn’t much matter that Keaton is in uniform or Miller’s performance is impressive. They’re drowned out by effects. The multiverse happenings (and we do see plenty of alternate realities with familiar faces) are becoming standard procedure thanks to Doctor Strange and Spider-Men. Barry’s familial dynamics are also well covered territory.

I’d have no trouble recommending The Flash if it stopped after about 75 minutes. Unfortunately it keeps running and the time remaining alters a universe in which it is ultimately satisfying.

**1/2 (out of four)