If I were a hero, I'd be Martin Luther (Part 1967)...

 Superhero Anydays

Today we have some of the members of Earth-2's World War II era All-Star Squadron. 

Tarantula, Wildcat, Firebrand, Manhunter, Guardian, Green Lantern, Liberty Belle, Hourman, Airwave, Johnny Quick, Phantom Lady, The Flash, Amazing Man and Robotman

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And we also have some Batman Family cosplay: The third Robin, Tim Drake, Batman and Batgirl.

POLT