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Sonic After the Sequel is a fan game created by LakeFeperd that acts as a interquel between Sonic the Hedgehog 2 and Sonic 3 and Knuckles.

Sonic After the Sequel (abbreviated Sonic ATS), is a fan game created by LakeFeperd that, like its predecessor, acts as a interquel, this time between Sonic the Hedgehog 2 and Sonic 3 and Knuckles. The player races through numerous zones as Sonic and Tails go out to stop Dr. Eggman from crashing the Death Egg into (and attacking) the mysterious island known as Angel Island.—AhmedDaReviewer

After the events of Sonic 2, Sonic is caught by Tails, who is piloting the Tornado. The duo then sees an island with a large metal ring hovering near its snow-covered mountain. They then decide to go and investigate this new island. After getting through Horizon Heights, Sonic encounters a small robot resembling Tails. It then activates and attacks Sonic, and after a brief duel, it's revealed to be a trap by Eggman.

Sonic is trapped in a magnetic forcefield, unable to stop Eggman from stealing the Chaos Emeralds. Just before Eggman could get his hands on them, Tails knocked the emeralds away, sending them back to the Special Zone in the process. Eggman then makes a hasty retreat to his temporary base, Storm Station Zone, with Sonic and Tails in hot pursuit. In the process, the two take out Eggman's Flying Battery Fleet, stop construction on a nearby forest (with the help of a certain red Armadillo), and fight the orb robot from the previous game. Along the way, they catch sight of a mysterious feathered object and find some oddly prophetic murals depicting a dragon and a golden warrior.

After breaking through Eggman's defenses at Storm Station Zone, the feathered object is revealed to be another of Eggman's machines and tries to speed toward Angel Island. Sonic goes super once more, and after chasing the machine into Dream Dance Zone, finally destroys it. Sonic comes out of a Giant Ring and meets up with Tails. The two head to Angel Island, and thus, the events of Sonic 3 and Knuckles begin.