Jason Spisak. Actor: Young Justice. Jason Spisak is an American actor and voice actor best known for his portrayal of Silco in Arcane, as well as Kid Flash in Young Justice and The Joker in Batman Hush, the Hell Priest in Doom Eternal. He produced The Unbelievers documentary, and was a co-founder of Lycoris and Symple. He is divorced and has two children.