With writer Gerry Conway, Heck co-created the DC cyborg hero Steel, the Indestructible Man in the premiere issue (March 1978) of the titular comic. After that series' cancellation, Heck became regular artist on "The Flash", and in 1982 reunited with Conway to draw the "Justice League of America", including that year's crossover with the "All-Star Squadron". Heck then returned to "Wonder Woman" and drew the title until its cancellation in 1986. Later that same year, he was one of the contributors to the "DC Challenge" limited series.