The titular Phantom, robot star of the the Universal serial The Phantom Creeps is one of the first, if not the first, robots to appear in funnybook format. He was featured in Movie Comics #6 (Sept-Oct, 1939), a rather strange series published by DC/National. If I am not mistaken, it was a rather large commercial failure at a time when comic books were a license to print money. The series mixed line drawing with movie stills. It was a bit of a mess, and it really has to be seen to be believed. Still, it's not everyday that you get the chance to see Bela Lugosi wearing a terrible fake beard in a comic book. To this day, the Phantom remains one of the coolest looking of all comic book robots.