Scrap-Iron had a pretty dramatic and brutal introducton in the comics as well. Blasting Soft Master with a rocket as he tried to save Billy, Candy, and an innocent civilian from a burning car and then nuking the car for no other reason than to negate the SM's final act of heroism.
That was WAY later after the series had already started to wane, though. I'm talking golden age RAH stuff, which was issues #8-40