After their last epic battle, Dr. Eggman's been mysteriously missing from Sonic's life. When Sonic gets a tip as to the bad doctor's whereabouts, he's off to investigate--but what he finds will shock him! Plus, Sonic isn't the only one looking for Eggman--so's his old frenemy: Shadow the Hedgehog! There are twists and turns in this high-speed, action-packed mystery-adventure! And with a little help from his friends--including a new ally--Sonic's fast enough to overcome any obstacle! Collects Sonic the Hedgehog #5-8.