From publisher blurb:
While the scenario, the ongoing quest, provides the meat in any campaign, a good Gamemaster needs more ingredients to add substance to the adventure, she occasionally needs to spice up slower parts of a gaming session. With that in mind Big Finger Games offers the GM’s Cookbook line of pdfs.
GM’S COOKBOOK: Superhero Subplots #1 is designed to provide you with guidelines for developing subplots for your superheroic campaign. A detailed sample subplot is included as well as a 3-page worksheet for developing and tracking subplots.
Superhero subplots are a staple of comic book storytelling. They are secondary to the main plot but allow a writer or, in the case of a roleplaying game, the GM and player to explore elements of the characters that aren’t normally featured. Subplots allow you to put some flesh on the bones of a hero, adding some dimension to the character’s personality.