Fuzion is a generic role-playing system published from a collaboration of two RPG publishers (R. Talsorian Games and Hero Games). It is a combination of two previous systems, the HERO system and the Interlock System. Two principal variations of Fuzion exist: Instant Fuzion and Total Fuzion. Instant Fuzion is the more basic version, Total Fuzion is the fully detailed version; both can be used with each other.
The Fuzion roleplaying system was used in several standalone roleplaying games, but several versions of the core rules and core rules various supplements were printed for Fuzion itself.