
Sonic Underground
A speed enhancing fluid deemed Sonic Tonic is created by Robotnik to make him as fast as Sonic so that he may finally catch him.

A speed enhancing fluid deemed Sonic Tonic is created by Robotnik to make him as fast as Sonic so that he may finally catch him.

Sonic becomes aggravated that maybe their efforts of fighting for freedom seem pointless. Sonia suggests that they go to the Oracle for advice.

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.

Sonia is invited to a debutante ball, but before she can be officially announced to society, she and her brothers, Manic and Sonic have an important mission.

Robotnik has his eyes set upon Queen Aleena's crown jewel, but Sonic, Manic and Sonia plan to retrieve the gem before Robotnik.

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.

While lost in the wastelands of Mobius, Sonic, Manic and Sonia stumble upon an oasis called Lake Valley Resort.

Robotnik severely upsets the ecosystem above and below the surface, when he sends explosive, Robotnik snake probes drilling deep under ground in search of oil lakes.

A group of Freedom Fighters is obliterated by a swarm of metallic fly-bots. When Manic goes looking for the insects, he is stung with serum.

The Hedgehogs steal historical artifacts of Mobuis from Robotnik before he can pawn them off at an auction.

The Hedgehogs find out that Sonia has inherited a castle. She basks in the idea of having a castle for headquarters.

Sonia is invited to a debutante ball, but before she can be officially announced to society, she and her brothers, Manic and Sonic have an important mission.

While lost in the wastelands of Mobius, Sonic, Manic and Sonia stumble upon an oasis called Lake Valley Resort.

On a mission to contact the first Freedom Fighters on the King's List, Sonic and the others are forced to travel through a tunnel which carries a "curse" against all intruders.

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.

After Sonic is almost sucked inside the Void, he finds a huge Ring which Sally believes is an ancient relic but it turns out to be trick of the Sorcerer, Nagus. Sally and Bunnie are drawn inside the Void and when Sonic comes to rescue them.

Antoine decides to study martial arts but after he wrecks most of Knothole Sonic sends him off to practice in the woods. //Tails begins his training to become a real Freedom Fighter by learning tracking skills while on a camping trip.

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.

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".

Sonic attempts a solo rescue to prevent prisoners from being roboti-sized and is hit by a Memory Scrambler that erases short-term memory.