What's the biggest difference between Ant-Man and its sequel, Ant-Man and the Wasp? Well, as basic as it may sound... The Wasp. 

For the most part, the second Ant-Man movie is what you expect it to be, which isn't a bad thing. It's fun, it's funny, and it's got such lower stakes than Avengers: Infinity War that it's practically the equivalent of a relaxing Sunday afternoon in the Marvel Cinematic Universe.

Sure, Scott Lang/Ant-Man (Paul Rudd) gets first billing and a bit more screen time than his partner in crime, but this is really the story of Hope (Evangeline Lilly), who has taken up the mantle of the Wasp. Like Ant-Man, the Wasp has no inherent superpowers, but she has a suit that allows her to shrink and grow at will. Unlike Ant-Man, she also has wings and a blaster, making her a cooler and more effective hero than her counterpart. 

The movie begins, somewhat abruptly, with a flashback to Hope's childhood and a theory from her father, Hank Pym (Michael Douglas), that her long-presumed-dead mother might actually be alive. See, Hank and his wife Janet (Michelle Pfeiffer) were the original Ant-Man and Wasp, shrinking down to tiny sizes and performing heroic deeds long before the likes of Iron Man and Spider-Man made it cool to be a superhero. 

While saving the world many years ago, Janet went sub-atomic, making herself so tiny that she became trapped in the "quantum realm." Hank tried to save her, but determined that returning from the quantum realm must be impossible ... until Scott Lang accomplishes that very thing in the original Ant-Man. (Boiled down like that, Ant-Man and the Wasp is one of the more comic book-y movies in the Marvel universe so far.)

Speaking of Lang, he's on house arrest following the events of Captain America: Civil War, in which he got on the government's bad side while siding with Cap against Iron Man. He's killing time with his daughter (making the coolest cardboard maze and slide ever seen in a movie) and attempting to run a security company with his fellow ex-cons when Hope arrives to drag him back into the role of Ant-Man so that, together, they can rescue her mother.

Here’s where ‘Ant-Man and the Wasp’ takes place in relation to ‘Infinity War’

They are, of course, thwarted by many people and things along the way, chief among them being the mysterious Ghost (Hannah John-Kamen), a woman that can phase through matter and seems intent on stealing Pym's valuable research and resources — in fact, she wants to steal his entire lab, which has been shrunken down to the size of a rolling piece of luggage.

While the original Ant-Man movie was a humorous heist, Ant-Man and the Wasp is more of a straight-up action movie with some slight hints of crime. Most of the movie's antics, action and gags are playful manipulations of size. A particularly exciting car chase scene, for example, involves cars constantly shrinking under obstacles and returning to full size at precisely the right moment to flip another vehicle. Other scenes involve objects and people becoming comically large.

"Ant-Man and the Wasp."

"Ant-Man and the Wasp."

Disney/Marvel Studios via AP

Some of the best humor, though, comes from Michael Peña reprising his role as dopey ex-con Luis. And yes, if you're a curious fan of the first movie, the character's fast-paced storytelling chops get some time to shine in the exact sort of scene you're hoping for.

Compared to the latest Avengers flick (which Ant-Man was missing from), this movie feels insect-sized in scope. The stakes are high for many of the people involved, but not for the world at large. Which, frankly, is kind of nice. The universe-altering events of Infinity War aren't even hinted at until the credits roll (but be sure to hang around after those).

Ant-Man and the Wasp doesn't do anything unexpected. Everything it does do, however, it does very well. It's not going to blow your mind, but it's a lighthearted ride that will keep you entertained whether you're big or small.

Ant-Man and the Wasp (B)

PG-13 (for some sci-fi action violence). 118 minutes. In wide release.

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