
Sonic Underground
On a trip to Port Mobius, Sonic, Manic and Sonia are told that ships are sinking due to the Mobian sea-beast.

On a trip to Port Mobius, Sonic, Manic and Sonia are told that ships are sinking due to the Mobian sea-beast.

The sinister Robotnik blackmails Cyrus, an old friend of Sonic's, by holding his father hostage.

Sleet and Dingo plan to collect the taxes owed to Robotnik from the Duke of Velcronia but keep it for themselves.

Sonia discovers that the watch she received from her friend is actually a monitoring device for the Robotnik Intelligence Agency.

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, Nagus pretends to be the King so Sonic will use his speed to transport him outside.

Robotnik installs a new "obedience microchip" in Scratch and Grounder and orders them to drill for a rare mineral in a tropical mountain. With his Freezomatic machine, Robotnik covers the mountain in ice and runs a Hermit out of his home.

Sonic reluctantly takes Tails with him to the Big City to find some cotter pins for the Freedom Fighters catapults. While in the City, Sonic is nearly eaten alive by his old dog Muttski, now a roboti-sized guard dog in the Junk Heaps

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.

When Sonic and The Freedom Fighters take out Robotnik's main computer, they're trapped by Swat-Bots in an underground tunnel, only to be rescued by a handsome teenager named Griff. Griff takes them deep beneath the Big City.

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.

Robotnik installs a new "obedience microchip" in Scratch and Grounder and orders them to drill for a rare mineral in a tropical mountain. With his Freezomatic machine, Robotnik covers the mountain in ice and runs a Hermit out of his home.

Momma Robotnik forces her son to run for President of Mobius with Wes Weasley as his campaign manager.

Throbbin Screech brings a TV crew to interview Robotnik for "Lifestyles of the Sick and Twisted". Robotnik rampages through the Mobius countryside proving how sick and twisted he is, and Sonic is kept busy doing rescues. Tails decides to take on...

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.

When Sonic vanishes mysteriously, Tails enlists the help of a bi-plane pilot named William Le' Duc, and Professor Von Schlemmer.

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.

When S and G rocket to outerspace to mine a radioactive mineral from asteroids, Sonic and Tails stow away. Through a blunder by the robots, all are stranded in space, and Robotnik tries to blow all of them out of the stars.

Robotnik installs a new "obedience microchip" in Scratch and Grounder and orders them to drill for a rare mineral in a tropical mountain. With his Freezomatic machine, Robotnik covers the mountain in ice and runs a Hermit out of his home.