Silver Age Sentinels: The Superhero Role-Playing Game
Action / Adventure (Superheroes) Multiverse Science Fiction (Time / Dimension Travel)
Attribute/Stat Based (STR, CON, PER, etc) Dice (Various) Point Based (allocate points to get skills, powers, etc) Skill Based (buy or gain skills)
A rules system for playing Silver Age style Superheroes. Originally released using Guadians of Order's TriStat system (with a d10 Power Level), it was later converted to a d20 system as well. SAS's original release was nominated for an Origins Award.
The core book included a complete alternate history involving a superteam called The Guard and their adversaries.