While Mutants & Masterminds players create heroes, the Gamemaster creates the villains, the adventures, and the entire world where the series takes place. That can be a lot of work, but the Mutants & Masterminds Gamemaster's Guide is here to help you. This book has everything an M&M Gamemaster needs, from guidelines on creating challenges and adventures to advice on designing your own setting and series. The Gamemaster's Guide includes guidance on how to set up and run your game and to help your players create the best heroes, archetypes that make building villains easy, world building tips, and options for modifying the game to suit your group's play style. The Mutants & Masterminds Gamemaster's Guide is a must-have resource for new and experienced GMs alike, and the ideal companion volume to the Hero's Handbook.