WE ARE YESTERDAY PART FOUR (OF SIX) The Batman and Superman of yesterday...today?! As Gorilla Grodd's vicious temporal onslaught upon the Justice League continues, the Dark Knight and Man of Steel from the time of the World's Finest get a horrifying glimpse into their own futures...and the tragedies to come! It's minute-by-minute mayhem in the epic new installment of the We Are Yesterday crossover with Justice League Unlimited!