Dr. Eggman's new capital city is expanding and only Sonic and his friends can stop it! On a recon mission with the new Diamond Cutters—Tangle, Whisper, and Lanolin—Sonic discovers that the Eggperial City is harnessing the resources around it to grow ever larger. The Diamond Cutters are still getting the hang of working together which leads to trouble when they get trapped. Alone against an army of badniks and a self-replicating city, Sonic calls for back-up and gets more than he bargained for: Tails, Amy, Blaze, and Silver all answer the call, but Shadow, Rouge, and Omega arrive for their own reasons too! While the Diamond Cutters have to have an emotional break-through to escape, Sonic and Tails coordinate a horde of heroes to try to bring the city down! Collects Sonic the Hedgehog issues #57–61.

Dr. Eggman's new capital city is expanding and only Sonic and his friends can stop it!

Sonic battles his nemesis, Robotnik, as the villain traps him with plants, attacks him with a mechanical bomb-throwing monkey, and kidnaps Sally.

"On a recon mission with the new Diamond Cutters--Tangle, Whisper, and Lanolin--Sonic discovers that the Eggperial City is harnessing the resources around it to grow ever larger. The Diamond Cutters are still getting the hang of working together which leads to trouble when they get trapped. Alone against an army of badniks and a self-replicating city, Sonic calls for back-up and gets more than he bargained for: Tails, Amy, Blaze, and Silver all answer the call, but Shadow, Rouge, and Omega arrive for their own reasons too! While the Diamond Cutters have to have an emotional break-through to escape, Sonic and Tails coordinate a horde of heroes to try to bring the city down!"--Back cover.

Following their last battle, Dr. Eggman’s been mysteriously absent from Sonic’s life. What shocking secret will Sonic discover when he learns the bad doctor’s whereabouts? Plus, Sonic isn’t the only one looking for Eggman—so’s his old rival Shadow the Hedgehog! There are twists and turns in the course of this high-speed, action-packed mystery-adventure! But with a little help from his friends—including a new ally—Sonic’s fast enough to overcome any obstacle! Collects issues #5-8 of the ongoing series.

Fan-favorite artist Evan Stanley takes over as writer! A new storyline begins, perfect for new readers, as Sonic races to help a friend in need! Hold on to your chili dogs, Sonic fans! The Metal Virus is gone, but things aren't back to normal. Omega is damaged, and his allies turn to Sonic for help. The only way to rebuild him is to trade parts with a mysterious champion Chao racer, so it's off to the races for Cream, Cheese, Amy, and Rouge! They'll have to keep up their winning streak or surrender Cheese to Clutch's evil... clutches! Meanwhile, Sonic and Tails are being watched by a mysterious figure in Dr. Eggman's seemingly abandoned base, but when Rouge's team calls for help, will this shadowy character prove friend or foe? Please keep your arms and legs inside the ride at all times, folks, this is going to be a bumpy one! Collects IDW's Sonic the Hedgehog issues #33–36.

It's all come down to this, but will Sonic be able to overcome the odds and emerge victorious? The world has completely fallen to the Metal Virus. Sonic the Hedgehog and his friends find themselves on Angel Island, the last safe place, launching a desperate plan with their old foe, Dr. Eggman, to defeat the Deadly Six and reclaim the Chaos Emeralds in a last-ditch effort to save the world. Collects Sonic the Hedgehog issues #25-29.