Kept forgetting to post this here. 11" by 17" on bristol, Pitt brush pen, pen and ink, rapidograph, Pentel correction pen. Kids: Remember to subtract "5" from whatever model number Ultron is currently sporting to figure out how many times the Avengers has kicked his metallic ass.
Ultron 5 created by Roy Thomas and John Buscema, who turned in a really effective design here. Ultron's skull/insectoid head is an economic marvel. Scary-looking guy, back when villains really never looked truly scary. It manages to convey a frozen-metal countenance but at the same time the gaping jaw and slanted eyes add a sense of violent motion. If that makes any sense. I didn't go to art school, so sue me.