Sonic the Hedgehog: The IDW Collection, Volume 4 (Sonic the Hedgehog #33-40, Sonic the Hedgehog: Bad Guys #1-4)

Dr. Starline is back to his evil antics! But to enact his latest scheme he'll have to get into an abandoned Dr. Eggman base and past an army of badniks! To do that, he'll need the help of some of Sonic's greatest enemies! Mimic, Rough, Tumble, and Zavok are back and badder than ever! Then, 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 Team 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!

But, when Dr. Eggman unleashes his latest attack, Sonic and Tails will have to rely on their friends to help them foil his newest dastardly plan! There's a new kid on the block! And a new... tower? While Tangle tries to initiate the new recruit, Belle, into the Restoration, Sonic, Tails, and Amy investigate a mysterious structure that has popped up. Turns out, it's a maze of twisting corridors and crazy challenges!

Collects Sonic the Hedgehog (2018) #33-40, Sonic the Hedgehog: Bad Guys (2020) #1-4.