This issue is a variant of Daredevil (Marvel, 1964 series) #86 [Regular Edition]. There exist further variants.
This Ox has the brain of the original Ox, transferred into Dr. Karl Stragg's body. A test of pharmaceutical isotopes in prison causes him to have less than a month to live, but also transforms him into the Ox.
Letters from Gary Nesmith (Johnstown, Pa.), Mike Wilson (Olympia, Wash.), and George Johnson & Roberta Liebreich (Eugene, Ore.) Also a spot illustration of a panel taken from an earlier issue.