It Was Pretty Easy To Turn 1960s Batman Evil

So how, exactly, does Batman become the sadistic warden of a space prison for super-heroes?

It starts with a visit from a ball of light...

But I thought the conclave was over now...

Oh, Batman, you've been suckered. Fortunately, you're an honorable man, so they alien plan is for naught, right?

Oh, Batman, you really should know better than that...

Now, having hung around with Superman long enough, you'd have thought that Batman would have been prepared for super-hypnotism, right? A back-up personality, a little Zur-en-arrh??

Nope. As I mentioned before, Silver Age Batman wasn't really that cool.

But how to imprison Superman there? Stay tuned...

From World's Finest #145 (1964), as reprinted in World's Finest #197 (1970)