1st appearance of Mr. Machine aka Machine Man aka X-51 aka Aaron Stack. 

1st appearance and death of Doctor Abel Stack, Machine Man's creator/father; Col. Kragg appearance. 

Written by Jack Kirby. Art by Jack Kirby and Mike Royer. Cover by Jack Kirby and John Verpoorten. 

Doctor Stack treated a robot man with respect and treated him as a son, but when the military decided to end the project, Doctor Stack gave his life to see that the robot survived. 

Based on concepts from the film by Stanley Kubrick & Arthur C. Clarke.