Spoiler alert! We're discussing major details about the ending of “Avatar: Fire and Ash” (in theaters now). Stop reading now if you haven’t seen it yet and don’t want to know.

His web connects them all.

Going into “Avatar: Fire and Ash,” we wouldn’t have expected for the story to revolve so prominently around Spider (Jack Champion), a potty-mouthed human teenager with an affinity for loincloths and blond dreadlocks. Surprisingly, the spunky wannabe warrior becomes the most consequential character in the third and possibly final movie of the blockbuster sci-fi franchise, whose previous two installments netted roughly $5 billion worldwide.

Unlike his sage alien love interest, Kiri (Sigourney Weaver), or protective father figure, Jake Sully (Sam Worthington), Spider doesn’t have special gifts or leadership qualities.

“He's not our most fantastic character, but Spider's the glue,” filmmaker James Cameron says. “All of the plot lines intersect through him.”