Here is the trailer for the Robot Chicken DC Comics Special. Though the preview mostly highlights Justice League and Legion of Doom characters,it looks like the special will jump all over the DC Universe. Solomon Grundy, Hawkman, Red Tornado, and Icicle are Earth 2 related characters that show up in the preview. I expect there will be more.
Robot Chicken DC Comics Special Sunday, Sept. 9 at midnight ET/PT on Adult Swim.