>>103142264The 1960s wasn't necessarily the Golden Age of Hollywood. You might consider it the golden age of super-heroism on television, but even with the popularity of the ABC series, more people probably saw the Donnerverse movies and the Burtonverse Bats than saw the show. For that matter, it's possible that the cumulative audience of the DCAU worldwide exceed the viewership of Batman '66.
But to answer your question, Universal had a cinematic universe well before the 1960s and the Batman live action movie is probably a good guide, except that rather than a collection of Bat related villains, it would have featured a Legion of Doom collection and a similar counterpart of Super Friends type Justice League (probably Diana, Bruce, Clark and one or two others for certain).
