
Sonic Underground
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.

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.

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.

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.

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.

Santa Claus has made an announcement - he is retiring and has picked the perfect successor - "Robotnikclaus"! Sonic and his sister resolve to persuade Santa to return and set Christmas straight. When the two track down the Santa who made the announcement, they discover he is just a phony robot and the real Santa Claus is being held prisoner.

When Sonic decides to find Tails a suitable foster home, Robotnik finds out, and creates a robot fox family which poses as Tails' long lost parents. Sonic leaves Tails with the fox family, but finally realizes they're robots and rescues Tails.

Tails gets a megadose of Robotniks growth gas and grows quickly to monstrous proportions, eating everything in sight and accidentally terrorizing the countryside.

Big Griz, leader of a group of biker-bear rebels, mistakes Scratch and Grounder for Sonic and Tails, and teams up with S and G to attack the real Sonic and Tails.

A fast talking, travelling salesman named Wes Weasley sells Robotnik various hedgehog-catching gadgets, including the Darkenator, the Super-duper Gravity Stopper, and the De-Atomizer.

Outraged by a new hit song written about Sonic, Robotnik outlaws music on Mobius then takes pop star, Catty Carlisle captive. With his MD (Music Destroyer) Robot, Robotnik terrorizes the music loving Mobius population till Sonic rescues Catty.

Coconuts is exiled by Robotnik to a remote jungle, where he uses a giant baby ape to destroy villages. But Sonic exposes Coconuts as a robot, and the baby ape's real Dad takes Coconuts and the baby ape away for a spanking.

Robotnik's momma escapes from the home for mothers of villains and demands her birthday present! When she endangers Sonic and Tails, and they manage to have her taken back to the home, even Robotnik is glad to see her go.

Sonic and Tails befriend a pair of aliens who crash land their spaceship on Mobius. Sonic has to avoid Robotnik's ULTRA-GRAVITIZER (sort of a hedgehog flypaper) to help fix their ship and blast-off back home.

Santa Claus has made an announcement - he is retiring and has picked the perfect successor - "Robotnikclaus"! Sonic and his sister resolve to persuade Santa to return and set Christmas straight. When the two track down the Santa who made the announcement, they discover he is just a phony robot and the real Santa Claus is being held prisoner.

In order to free Sketch Lampoon (a satirical comic book artist) from Robotnik's new high security prison, Sonic allows himself to be captured, then makes a high speed rescue and escape.

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.

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.