Few figures in comic book lore command the attention and devotion of Stan Lee. Now in his late eighties, with a grey-white caterpillar of a moustache perpetually perched atop his upper lip and oversized, dark-tinted glasses, he’s an easily identifiable character, as iconic as one of his pop culture creations (Fantastic Four, Spider-Man and the X-Men, to name a few), and just as important. But many don’t know the story behind the man. “With Great Power: The Stan Lee Story,” a zippy and somewhat superficial documentary, attempts to fill in some of that backstory, and the result is as compulsively entertaining and colorful as any Marvel comic book. Excelsior!