Sonic Underground

Robotnik makes an announcement that he and Queen Aleena will be wed so he can become king of Mobius.

Argus, le capitaine de la garde royale, est capturé en se rendant à son rendez-vous secret avec la Reine Éléonore. Sonic, Manic et Sonia l'apprennent par message radio et décident de libérer le capitaine des mains de Robotnik.

Argus, is captured by Sleet and Dingo before he can reach the secret rendezvous where he was to meet Queen Aleena.

A homecoming is interrupted for Sonic, Sonia and Manic when Sleet and Dingo arrive to collect back taxes after returning to their birthplace.

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

Sleet and Dingo make a plan to collect the taxes due to Robotnik but they intend to keep it for themselves.

Robotnik blackmails Cyrus by kidnapping his father and holding him hostage.

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

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.

While adrift in the wastelands of Mobius, Sonic, Manic and Sonia stumble upon a haven called Lake Valley Resort.

Sonia is invited to a debutante ball, but before she can make her debut into society, she and her brothers have to go on an important mission.

Robotnik organizes a track meet to lure Sonic into a trap.

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

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

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.

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

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

The Hedgehogs congregate on the Floating Island in their latest effort to find their mother. But Sleet and Dingo also have an interest in this island.

Dans leur dernière tentative de retrouver leur mère, les hérissons convergent vers l'Île Flottante. Mais ils y retrouvent Dur-Dur et Louvois, tous deux intéressés par l'Émeraude Cataclysme, la force vitale de l'île. Sonic, Manic et Sonia devront alors sauver l'île.

Sonic finds a note from his mother advising him to go to Speedster Island. When he and his siblings get there, they encounter an ancient sanctuary.

Sonic finds a note from his mother advising him to go to Speedster Island. When he and his siblings get there, they encounter an ancient sanctuary.

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

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.

Sonic and his siblings journey to the outskirts of Mobius to recruit a tribe of drifters for the Resistance.