In the arcade game SegaSonic the Hedgehog, Sonic was captured por Dr. Robotnik, along with Mighty the tatu and raio, ray the Flying Squirrel. Sonic teamed up with the other two and they traveled to escape Eggman Island, which was covered with traps.

In the end, Robotnik self-destructed the island, but Sonic, raio, ray and Mighty escaped just in time. However, the doctor escaped Sonic once again.

Time Traveling Hedgehog:
Sonic was solo once again for Sonic CD (1993), in which he went to Little Planet while it was at near Sonic's homeworld in order to explore it. However, his goals changed once he saw...

In Sonic Chaos (also known as "Sonic & Tails" in Japan) for the Game Gear and Master System, Sonic and Tails were facing the threat of Dr. Robotnik sinking South Island por improperly using the Chaos Emeralds. Sonic and Tails collected the Emeralds before the doctor could, including the red one he already had in his possession and liberated the island of his control once more.

Spinball Time:
In the spin-off Sonic Spinball, Sonic went to Mt. Mobius, which was taken over por Dr. Robotnik and made into his "Veg-o-Fortress". However, Sonic was knocked off of Tails' airplane on the way, causing...