The setup is simple. Young Robby finds a presumably alien dial which can turn him into various superheroes. No explanation is ever given although it becomes Topic # 1 in the letters pages! Some are cool (THE COMETEER), some are lame (MIGHTY MOPPET) and some are retro (PLASTIC MAN!) but all are, at least in these early issues, beautifully rendered by artist Jim Mooney with scripts by Dave Wood.
The concept has been revived a number of times with and without Robby including the requisite "grim and gritty" version but the most successful version of the Dial H For Hero concept, although unofficial, would have to be TV's BEN 10!