The X-Men Roster Book is a supplement for the Marvel Super Hero Adventure Game. There is a short introduction, "What is a Mutant?", and brief descriptions of eight super groups, but the majority of the book is an alphabetical roster of the X-Men, their allies, and their enemies.

From the back cover:

"To me, my X-men!"

Homo sapiens superior

They are men and women whose genetic structure has gifted—and cursed—them with extraordinary abilities. Most people call them "mutants," a word that invokes both fear and awe among the common people on Marvel Earth.

Shunned and feared by society at large, some mutants struggle to bridge the ever-widening gulf between humanity and mutantkind by protecting a world that fears them. Others turn their powers to crim, destruction, and even attempts at world domination.

This roster book, an accessory for the MARVEL SUPER HEROES Adventure Game, is a reference guide to many of the most popular characters from the World's Greatest Comics. Narrators and players can use them to launch their favorite heroes and villains into exciting roleplaying scenarios. Highlights of this book include:

• Details on the Uncanny X-Men, Excalibur, Generation X, Alpha Flight, and other teams of mutant heroes and villains!
  
• Descriptions and game statistics for well over 100 of the X-Men's greatest members, friends, and foes!
  
• Action-packed illustrations by the Marvel Bullpen!