This is the family of RPGs published by Mayfair Games under license from DC Comics in the 1980s. It preceeds the DC Universe RPG from West End Games by a decade.
The DC Heroes line is also known as the Mayfair Exponential Games System (MEGS). MEGS was developed for DC Heroes and Mayfair went on to use MEGS in other games.
Grenadier Models did produced five boxes sets of 25mm DC Heroes miniatures for the DC Heroes RPG.