The Sonic Adventure story arc is a series of ten stories in Sonic the Comic which, when read in succession, form a loose adaptation of the video game, Sonic Adventure. It was also the last new storyline to be printed before the comic went fully reprint.
Story[]
Dr Robotnik falls into a deep depression after his recent failure to wipe out all life on Mobius. Desperate to motivate his master, Grimer releases a liquid monster called Chaos upon the Metropolis Zone, hoping to later regain control of it with the Anti-Chaos Nullifier, which unfortunately doesn't work. The Freedom Fighters learn of Chaos' rampage and try engaging it into battle, only to be driven away by a tremendous sense of fear the monster emanates. Only Sonic is able to get close, and his initial encounter with Chaos leaves him with green eyes, thought the effect soon limits itself to his irises. Porker Lewis turns up with a device that will briefly dispose of Chaos, though a cable is unconnected when the creature is atop the machine. Johnny Lightfoot is able to get it working, but is brutally killed by the monster, just before the machine is activated. Sonic blames himself for Johnny's death and leaves the team hoping they'll be safer that way. Meanwhile on the Floating Island, Chaos comes to claim the Chaos Emeralds and Knuckles is unable to fend him off. Ultimately he is forced to eject the Emeralds from the Emerald Chamber, and Tails and Amy are just able to persuade him to leave with them before the Floating Island crashes into the ocean. Sonic rejoins the team shortly after, but soon finds himself transported into the ancient past by Tikal, where he witnesses the beginnings of the Great War between the Echidnas and the Drakon Empire. At the same time, Robotnik is in his retreat and using his Chaos Resonator to summon the Chaos Emeralds and thus Chaos himself.
In the ancient past, when a captured Drakon Prosecutor is caught in an explosion involving the Chaos Emeralds and his watery prison, he mutates into Chaos. While the past Knuckles leads his fellow echidnas in battle against the Drakons, Sonic enages Chaos in battle, and is returned to his own time when trapped in the monster's chest. In the present, both Chaos and the Freedom Fighters have tracked the Emeralds to Robotnik's retreat, where Robotnik gleefully anticipates the deaths of all gathered. Sonic re-emerges from within Chaos, but the monster absorbs the Emeralds into itself, becoming Perfect Chaos. Sonic tries removing the Emeralds from within Chaos, but soon Ebony and a dying Super Sonic arrive. Super is in dire need of a recharge and hurls himself into the monster, draining it of all its power. This unfortunately turns him evil again, and he begins violently attacking all gathered after disposing of the now harmless Chaos. As Grimer quits Robotnik's service, Sonic begins fighting Super Sonic, and appears to be vaporised by Ebony's magic spell. However, she has merely merged the two hedgehogs together again, and Sonic re-asserts himself over Super. As dawn breaks, the Freedom Fighters prepare to face an unknown future, vowing to deal with whatever happens as an image of Johnny smiles upon them.