From the back of the book:
True, this may be the Age of Heroes, but what does that mean for the Marvel villains?
Five heroes who have rarely, if ever, worked together are the sudden recipients of a strange summons. As they band together, they begin to unravel the strange secrets of a villainous Network. But what is the Network, how far does its reach extend, and for what dread purpose are they organizing themselves?
Take the role of one of the heroes committed to uncovering the secrets of the Network in this exciting adventure based on the classic Marvel Super Heroes Role-Playing Game published by TSR, Inc.
Otherwise, Marvel’s Heroic Age may be over before it’s truly begun!