Notes:
Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Synopsis:
Lex Luthor and Joker go into business together making Mechano-Men, near indestructible robots. Superman and Batman believe they have not gone straight and try to figure out their master plan.