Which system by Hero Games is a combination of the Interlock and HERO systems? 
Hero Games: Hero Games ("DOJ, Inc dba Hero Games") is the publisher of the Hero System, a generic roleplaying rules set that can be used to simulate many different genres, and was the co-developer of the "Fuzion" system. Fuzion:  "Fuzion" is a combination of the Interlock System, (used in games like "Mekton" and "Cyberpunk 2020"), and the HERO system (used in "Champions", "Justice, Inc.", "Star Hero", etc.).
Fuzion