It began in the 90's with Batman, then Superman was added, then they mercged into the Batman-Superman adventures... then there was Static Shock, Batman Beyond. Who knew Mark Hamil/Luke Skywalker was the Joker? Then they made the Justice League and the Legion of Superheroes... and now they're doing more with the same voice actors like Justice League: Doomsday.
Personally I think they're still pretty good.
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