Robotnik captures a Kangaroo named MacHopper, and uses his "brain-wipe-reprogramming-computer" to transform him into a resourceful demolitions expert (Ala MacGiver).
Robotnik timetravels back to Mobigypt, makes himself a pharoah, and enslaves everbody in an effort to find the gemstone of immortality.
Rumor has it that Queen Aleena's journals are buried in the city of Tashistan. Sonic and his siblings search the city for the scrolls.
When Robotnik launches a spy-orb that will uncover the Freedom Fighter's Knothole location, Sonic and Robot launch themselves up to the orbiting spy-sphere aboard a home-made rocket powered by Robotnik's discarded booster engine.
When Sally uncovers Robotnik's plan to seed the cloud with toxic rain, they attempt a daring mission to sabotage the dirigible-like craft being transported by land vehicles. Mission fails when Sally, Bunnie and Antoine are captured.
When a blizzard hits Knothole causing Dulcy to demolish a few huts during a landing, Sonic is forced to bunk with Antoine. // During a rainstorm, Rotor is putting the finishing touches on his new female robot assistant, named Ro-Becca.
Tails brings a new friend home to Knothole - a baby Terra-Pod who has strayed from the herd that is currently migrating. Sonic, Sally, and some of the other Freedom Fighters return the Baby-T to its mom and the rest of the herd.
Sonic is hired into an obvious trap when a frustrated Robotnik decides to appeal to the Hedgehog's ego and announces a "race to determine the fastest on Mobius".
After a disastrous failed mission, Sonic laments that they can't go back and prevent Robotnik's take-over. Dulcy tells them they can and takes Sonic and Sally to the Floating Island where they find the "Time Stones".
When Uncle Chuck's "bug" reveals Robotnik's search for the legendary Deep Power Stones, he informs Sally, who tries to retrieve data regarding the Royal Family Secret. But she's denied access via a time-encoded lock-out.
Bob and the gang have got a big job on - repairing some pipework in Farmer Pickles field. / Bob, Scoop & Muck have to make repairs to a tunnel. When they arrive on site, Bob sends Muck ahead into the tunnel with a load of bricks.
Sonic, Manic and Sonia find an abandoned baby in an alley and begin to look for the baby's parents. Manic becomes very fond of the child.
Robotnik announces that he will marry Queen Aleena in a plot to become the king of Mobius.
The Hedgehogs steal historical artifacts of Mobuis from Robotnik before he can pawn them off at an auction.
Sleet and Dingo plan to collect the taxes owed to Robotnik from the Duke of Velcronia but keep it for themselves.
Robotnik organizes a track meet to lure Sonic into a trap.
In Part II, Sonic and Sally steal the Roboti-sizer plans, stop the Destroyer from polluting the Great Forest and save Little Sonic, Little Sally and Dulcy's mother, Sabina.
Wes Weasley lures Tails, Sonic and all of their friends to a yacht under the guise of a "Hero of the Year" ceremony to thank Sonic.
Scratch and Grounder build their own robot, a naive over-grown kid called "Robot". When Robot runs off with Robotnik's new invention, the Super Planetary Implosion Module (SPIM), capable of impoding huge parts of Mobius out of existence, the race...
Sonic loses his memory when Robotnik uses a hypnotic flower pollen on him, and tells him he's just an "ordinary" guy.