Sonic, and the hedgehog's friends against Darkseid as he apparently gains the power of the notorious Chaos Emeralds. Perhaps it's that chaos that will lead to the mash-up between the heroes ...

Sonic the Hedgehog ... Emerald with the words “35th Anniversary” emblazoned on it. As for the new piece of Sonic art, the hero can be seen giving a thumbs up while surrounded by the Chaos ...