llozymandias, let's not forget scientist Ray Palmer (aka The Atom).
As for your #2, here's a summary from DarkMark's excellent Comics Indexing Doman at
http://darkmark6.tripod.com/indexintro.htmlWorld’s Finest Comics No. 146
December 1964
Cover: Batman and Superman looking at two photos of young Bruce Wayne as “Bruce-El” //Curt Swan / George Klein
Story: “Batman, Son of Krypton” (Part 1; 8 pages)
Part 2: “The Destroyer of Krypton” (9 pages)
Editor: Mort Weisinger
Writer: Edmond Hamilton
Penciller: Curt Swan
Inker: George Klein
Feature Characters: Superman (last appearance in ACTION COMICS #319; next appears in SUPERMAN #174), Batman (last appearance in DETECTIVE COMICS #334; next appears in SUPERMAN #174; also appears as young Bruce Wayne in flashback; see Batman index for chronology; origin details revealed), Robin (between DETECTIVE COMICS #334 / 335)
GA: Supergirl (between ACTION COMICS #319 / 320), Kandorians
Supporting Characters: Jor-El, Lara (in flashback; see Comment under MORE FUN COMICS #101 for chronology)
Intro: Thal-Arn (in flashback), Dr. Thomas Ellison (only appearance for both)
Cameo appearance: Zinn-Zal (a Kryptonian hero; first and only appearance; as a statue)
Villains: Jax-Ur, Prof. Vakox (both between ACTION COMICS #310 / 321 (Supergirl story))
Comment: This story features the first appearance of the Kryptoniad, the epic poem of the civilizing of Krypton, of the Red Tower, the Kryptonopolis capitol building, and of the Three Sisters of Krypton, three synchronized fire-geysers.
Synopsis: When Batman remembers bits and pieces of Kryptonian culture and history and comes upon pictures of himself as a child apparently demonstrating super-powers, he is convinced that he may be another refugee of Krypton, whose powers were stolen by a Gold Kryptonite exposure. But he and Superman learn that his memories come from his association with Dr. Thomas Ellison, a scientist whose powerful telescope had enabled him to view Kryptonian life, who attempted unsuccessfully to thwart the explosion of Krypton with a ray, and who posed young Bruce Wayne, whom he baby-sat and taught Kryptonian lore, in photos that made him appear to have the powers of a Kryptonian native on Earth.
----------------------------------
Question: some consider "World's Finest" and "The Brave and the Bold" stories outside mainsteam Earth-1 continuity. So did the above story actually take place on Earth-B?
Any opinions?