The 25 Years of Sonic the Hedgehog

Sonic the Hedgehog 4 Episode II (2012)

After the events of Sonic the Hedgehog 4: Episode I, Sonic and Tails were riding the Tornado through the clouds. Sonic ordered Tails to land into Sylvania Castle Zone. They then made their way to the end of the castle and defeated Dr. Eggman in his new contraption: the Egg Serpentleaf.

They headed into Eggman's amusement park amidst the snow mountains of White Park Zone, where they saw a mechanical construction surrounding Little Planet in the skies above. They then came face to face with Metal Sonic on Tails' Rocket. He hopped off and they battled. Sonic and Tails were victorious, and they headed to Eggman's newest base, the Oil Desert Zone. They then defeated Eggman's new Egg Scrap Mech, and pursued him into the air on the Tornado, but were suddenly attacked by Metal Sonic in the new Metal Carrier. They landed on the Sky Fortress Zone, and managed to defeat Metal Sonic.

Eggman and Metal Sonic then fled to the Death Egg mk.II Zone, metallized around Little Planet. Sonic and Tails then defeated Metal Sonic and Eggman, pursuing Metal Sonic. They defeated him in a race similar fashion in Stardust Speedway from Sonic CD, leaving him out of the picture for the time being. The heroic duo made it to the center, where they defeated Eggman's new Egg Heart. The battle caused the Death Egg mk.II to be destroyed, but Sonic and Tails managed to escape in two escape pods and landed down to Sonic's world, while the Death Egg mk.II was drained of its power and was left deactivated in space. Little Planet was presumably still trapped inside the Death Egg mk.II.