Lore

In Sonic the Hedgehog 2, Sonic teams up with his new sidekick, Miles "Tails" Prower, to stop Dr. Robotnik from enslaving animals and using the seven Chaos Emeralds to power his new space fortress, the Death Egg. The story involves travelling across West Side Island to collect the emeralds and defeat the doctor, with the potential to transform into the invincible Super Sonic if all emeralds are gathered.