GOTTA. GO. FLASH-FAST. It's a crossover event unlike any other! The monstrous Darkseid crosses dimensions to invade the world of Sonic the Hedgehog, seeking the ultimate power. Sonic and his friends have faced everything from mad scientists to ancient spirits, but the forces of Apokolips may be too much for them. Thankfully, the full heroic might of the Justice League arrives to back them up! Don't miss part one of this unique crossover event!