Continuing the countdown of the most insipid Silver-Age bad guys to tackle the Justice League of America . . . .     By 1963, the ranks of the JLA had expanded to nine super-heroes.  It’s quite a task, coming up with villains formidable enough to threaten that many heroes at once, especially when a plot wasn’t padded over a multi-issue arc, as is common to-day.  JLA writer Gardner Fox had to come…