President Lex storyline in issues #1-6.
New Toyman & Superboy/Robin team up in issue #7.
First appearance of Supergirl in issue #8, and all issues of her first run through the DCU.
Time travel & Legion of Super-heroes with an altered state Superman/Batman up through issue #18.
Superman/Batman #19 later reprinted as Supergirl #0 with a different cover. First “solo” Supergirl story (in this version).