Deep into “The Amazing Spider-Man 2,” my 11-year-old companion was confused about a certain plot point ― justifiably, I’d say ― and demanded an immediate and thorough explanation.

“Shh, not now. Later!” I hissed. Because, though I didn’t admit it, I really didn’t want to miss an Andrew Garfield-Emma Stone kiss. And who knew when the next one was coming?

With great chemistry, you see, comes great kissing.

Let’s just say this unequivocally: Whether or not my young Spidey fan would agree, the best thing about the “The Amazing Spider-Man 2,” the second installment of director Marc Webb’s series reboot, is that infectious chemistry between Garfield and Stone. In fact, given that this overstuffed, overly long film is a sequel to a sequel, and that it spends a gazillion dollars retelling a story (in 3-D and IMAX) that the world already knows, you could argue that the Garfield-Stone dynamic is the real justification for the whole enterprise. 

This isn’t just because the two happen to be real-life partners ― though it can’t hurt. Garfield is a sensitive actor who brings a quirky blend of intelligence and goofiness to Peter Parker, and a welcome hipster edge to the role that the wide-eyed Tobey Maguire didn’t have in the earlier incarnation of the Marvel character.

As for Stone, she’s just so darned charming. And though it’s again a stretch to imagine her as a high school student, heck, we’ll take it. (In fact, Stone is 25 and Garfield is 30, so we’re just gonna have to give them a pass on this. At least they get their diplomas this time.)

Another winning presence is that of Sally Field, touching as the now-widowed Aunt May. The reliable Field gets one terrifically emotional scene with Peter that may have you reaching for a tissue.

As for the plot, though, that may have you reaching for a notepad. There are not one, not two, but three villains (at least!) here, and all sorts of backstories ― something for everyone, which means too much.

The most important backstory involves Peter’s parents, and what really happened to them once they abandoned him as a tot (hint: it involves a very fast-paced plane ride).

Back on terra firma, we start with an even faster-paced urban chase involving Spider-Man, a hammy, Russian-accented Paul Giamatti, and some plutonium, distracting Peter/Spidey from Gwen, who’s anxiously awaiting Peter’s arrival at their graduation.

Peter does arrive, miraculously, but we quickly learn that the key obstacle to their relationship remains in place: Peter’s fear of putting Gwen in harm’s way. Haunted, Peter just can’t commit (they always have an excuse, right?) Not surprisingly, Gwen gets very charmingly annoyed, and kinda sorta breaks up with him. But these two can’t stay apart for long.

Meanwhile, there are big goings-on at Oscorp, that huge bioengineering corporation headed by Norman Osborn. With Norman on his deathbed, son Harry (Dane DeHaan) Peter’s old buddy, returns from boarding school. The pale, wiry DeHaan is entertainingly creepy as he descends into desperation.

Then there’s the unappreciated Oscorp employee Max Dillon (Jamie Foxx). When he falls into a vat of mutant electric eels (OSHA would have a field day at Oscorp), he morphs into Electro, a glowing monster who can manipulate electricity and suck the power from a whole city (Foxx is more convincing as the villain than the self-effacing scientist). (AP)