You have to give credit to James Wan that “Aquaman” is as good as it is. The “Saw” and “The Conjuring” filmmaker doesn’t do anything halfway. He took a character from the hit-or-miss DC Comics Extended Universe, best known from the HBO show “Entourage” and a brief “Justice League” appearance, and made the biggest, goofiest, craziest aquatic superhero action movie he could. “Aquaman” is pure camp, wildly entertaining and an eye-popping spectacle. You have to admire the effort, scope and sheer audacity of everyone involved — especially Wan, who throws it all at the screen. To his credit, most of it sticks, if you’re willing to dive right into this wacky ocean adventure.

Nicole Kidman sets the tone for this bombastic and kooky movie, playing a quirky mermaid Barbie who washes ashore and is rescued by a kindly lighthouse keeper, Tom (Temuera Morrison). She’s Queen Atlanna of the underwater kingdom Atlantis. The fruit of their union is the hunky, long-haired Arthur (Jason Momoa), half-human, half-Atlantean and bestowed with his mother’s unique oceangoing gifts — underwater breathing, super-strength, extremely good fighting skills — which he applies to taking down high-tech pirates, clad only in jeans and tattoos.

The plot is a globe-trotting, seafaring scavenger hunt to track down King Atlan’s trident so Arthur can challenge the war-mongering Orm’s claim to the throne of Atlantis. It’s a zany journey, as Princess Mera (Amber Heard) and Arthur travel to the various ancient Atlantean kingdoms by sea and land for clues. They stop off in the Sahara and in Sicily, while fighting off the stormtrooper-esque commandos sent to kill them by Orm, as well as the vengeful, laser-eyed supervillain Black Manta (Yahya Abdul-Mateen II).

This is the kind of movie where Mera will inexplicably play a flute, and Arthur frequently loses his shirt for no reason at all. But why question it? A giant octopus pounds war drums — heck yeah. It’s funny, intentionally, and at times, immaturely so. But Wan’s enthusiasm is infectious, his effort exhaustive. The Lovecraftian aesthetic is big, bold and intoxicating, the tone pleasantly light and the references deep.

It’s an overstuffed two-and-a-half-hour behemoth, and though it skimps on things like character development, there’s enough to distract from that. Wan and screenwriters David Leslie Johnson-McGoldrick, Will Beall and Geoff Johns know this movie is for kids and for those who want to feel like kids at the movies, and this visual extravaganza delivers just that. So come on in, the water’s fine.

MOVIE REVIEW

“Aquaman”

Grade: B

Starring Jason Momoa, Amber Heard and Nicole Kidman. Directed by James Wan.

Rated PG-13 for sequences of sci-fi violence and action, and for some language. Check listings for theaters. 2 hours, 23 minutes.

Bottom line: A visual extravaganza that's pure camp