This Superworld Companion expands the world of super-powered roleplaying. It includes: changes for and variants of Superworld powers: new ways to use powers such as Absorption, Defense, Dimension Shift, Emotion Control, Fortune, Gimmick, Illusion Projection, Invisibility, Martial Arts, Mimic, MicroSIZ, Reduction, Resistance, Snare, and Teleport.

New Powers: Aura Enhancement, Aura Defense, Cancellation, Clairvoyance, Cosmic Consciousness, Hex, Immunity, Infection, Lightfoot, Mental Image, Microscopic Vision, Paralysis, Possession, Power Sense, Quake, Resurection, Shield, Siphon, Special Sense, Tongues, Transform, Ultraviolet Vision, Verification, Wall, and Weather Control.

Also included in the Superworld Companion are conversion systems to Champions and to Villians and Vigilantes, an indepth treatment of weather and weather-related powers in Superworld, and a fully described base with working danger rooms for heroes or villains (usable with Superworld and Champions).