This article contains information on the manuals that were included with copies of Sonic the Hedgehog (1991).
The English story prologue found in the original western manuals:
- Crush Dr. Robotnik!
- Dr. Ivo Robotnik, the mad scientist, is snatching innocent animals and turning them into evil robots! Only one tough dude can put an end to the demented scientist’s fiendish scheme. It’s Sonic, the real cool hedgehog with the spiked haircut and power sneakers that give him super speed.
- Help Sonic fight hordes of metal maniacs and do the loop with the Super Sonic Spin Attack. Speed down twisting tunnels and swing over dangerous booby traps. Leap across lava pits and dodge burning rocks. Then splash through the chilling waters in an underground cavern. And if you’re lucky, you can warp to the secret zone where you spin around in a floating maze! Your greatest challenge lurks in a secret lab where you come face to face with Dr. Robotnik himself!
- Spin through space, loop ’til you’re dizzy, save the animals and become the super hero. Be Sonic! Be atomic!
A translation of the story prologue from the Japanese manual:
- The evil mad scientist Dr. Eggman is up to his old nasty tricks again. "Sonic…that annoying, impertinent hedgehog. Thanks to him, my great plans are always laid to waste! Oh, but this time, I'm going to rub him out with the power of science! Ha ha ha ha ha…"
- South Island is a treasure trove of gems and ancient ruins. They say that it's the island where the mystical Chaos Emeralds lie. The Chaos Emeralds are a super-material that give energy to all living beings. Also, when applied to scientific purposes, they can be used for nuclear and laser based weaponry. However, nobody knows exactly how to get a hold of these emeralds. At the same time, though, they do say that the reason why South Island is always moving is because the emeralds are somewhere inside the island's hazy depths.
- One day, crisis visited upon the island. And who showed up with it but Dr. Eggman and his cronies. "I'll find those emeralds even if I have to dig up the entire island to do it!"
- Dr. Eggman set up a fort in one corner of the island, and went about carrying out his plan.
- "Eggman, you still haven't had enough? Sonic hurried as soon as he heard the news. Dr. Eggman never seemed to leave him alone, even though Sonic had beaten him every time so far. It sounded like Dr. Eggman considered Sonic his sworn enemy, but he was never any match for Sonic.
- However, this time something is amiss.
- "Have you seen it, Sonic? This time is going to be different! Because this time, I've turned all the animals on the island into robots!"
- "All of them go about in accordance to my orders. In other words, Sonic, everyone on the island is your enemy! Gya— Ha ha ha ha ha ha ^cough^ ^ack^ ^ahem^. This time, the world really will be all mine!"
- This is terrible! Hurry! Sonic the Hedgehog - everyone is waiting for your help!