#8 - Origin of Boy Thunder
#10 - Identity of Boy Thunder revealed to be Magog
#15 - 1st full appearance of Ultra-Morpho / 1st cameo appearance of Newmazo
#16 - 1st full appearance of Newmazo, the 2.0 version of Amazo
#18 - Origin of Superman and Batman’s first meeting
#25 - Origin of Lex Luthor and Joker’s first meeting