Action Comics #590 1987

In Action Comics #590, Clark Kent's accidental fall into a chemical vat leads to the rebirth of Chemo, now imbued with Superman's powers. This issue marks the first post-Crisis appearance of the Metal Men, who join forces with Superman against the empowered villain. It is also notable for featuring the first post-Crisis appearance of Lois Lane and Clark Kent in a significant role within Action Comics. The story includes the destruction of Metal Man Tin and Dr. Magnus's surprising refusal to rebuild him.