Iron Man #257 1990

In Iron Man #257, published by Marvel in June 1990, Tony Stark and Jim Rhodes journey to Japan for a business meeting. There, Iron Man confronts Samurai Steel, a vengeful robotics CEO whose parents died in the Hiroshima bombing, blaming Tony's father for his involvement in the Manhattan Project. The conflict culminates in Samurai Steel's sacrifice to prevent a nuclear meltdown. This issue is notable for collectors as it marks the first appearance and death of Samurai Steel, and reveals Howard Stark's connection to the Manhattan Project.