Sonic Underground - Season 1 (1999)

Argus, a captain of the Queen's guard, is captured by Sleet and Dingo before he can reach the secret rendezvous where he was to meet Queen Aleena.

Sonic, Sonia and Manic return to their birthplace, Mobodoon, a beautiful, festive town.

Sonia travels to east Mobius to visit her friend Mindy at the LaTour estate.

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

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

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

Queen Aleena's royal journals are rumored to be buried under a palace in the city of Tashistan.

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

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 organizes a track meet to lure Sonic into a trap.

The Hedgehogs receive a message they believe is from their cousin.

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

A faction of the Freedom Fighters is wiped out by a swarm of metallic fly-bots.

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.

The Hedgehogs converge on the Floating Island, in their latest attempt to find their Mother.

As Sonic begins to chow chili dogs for a snack, he finds a message in the sack from his mother urging him to head to Speedster Island.

Sonic becomes frustrated that maybe all of their efforts of fighting for freedom seem futile.

Robotnik has his sights set upon Queen Aleena's crown jewel, which glows as it is moved closer her.

Sonic, Manic and Sonia find an abandoned baby in an alley and begin a search for the baby's parents. Manic grows particularly fond of the child and decides that instead of taking the baby to a shelter as Sonic and Sonia ordered, the baby would be more comfortable at the Underground sanctuary. While Sonia and Sonic are working to uncover another plot of Robotnik they find that the baby is not a baby at all, but an android equipped with cameras to spy on the Underground. Sonia and Sonic frantically search for their brother before he, unknowingly, exposes the location of...

Sonic and his siblings travel to the outskirts of Mobius to recruit a tribe of nomads for the Resistance.

Sonic, Manic and Sonia invade Robotnik's lair to retrieve the Hedgehog crest.

The Hedgehogs latest quest to find their mother takes them to the prison tower where they encounter a masked stranger who insists he is family.

The Oracle advises the Hedgehogs to undertake a mission which could reveal answers about their future.

What is supposed to be a vacation for Sonic, Manic and Sonia turns into a battle to save Mobius when Robotnik attacks with his newest weapon - the Flying Fortress.

Sleet and Dingo escape the Flying Fortress with the Chaos Emerald.

Knuckles reluctantly makes a deal with Robotnik to turn over Sonic and his family in exchange for finding the Chaos Emerald that will save Mobius.

Robotnik announces that he will marry Queen Aleena in a plot to become the king of Mobius.

Queen Aleena advises the Hedgehogs to travel to a valley of Mobius so that they can bring about peace between two contingents of the resistance that have split.

Robotnik is using the local hairdresser, Doo-bot, to get information on the citizens that are against him.

A self proclaimed scientist has come to Robotropolis with a device that will reverse the effects of Robotnik's robotisizer.

Robotnik has arranged a museum exhibit of the Royal family goblets.

The Hedgehogs vacation is interrupted by the news of Robotnik's latest weapon.

On a mission in a distant sector of Robotropolis, the Hedgehogs are informed that freedom fighters have disappeared and are going to be robotisized.

Robotnik captures Bartleby and uses him as bait to capture Sonia.

Robotnik's new weapon, Art, is the enforcer of Robotropolis new eradication policy.

The newly discovered Emerald Peninsula is a perfect place for Robotnik to add slaves to his empire.

Sonic and Manic play a game of virtual reality to enhance their pilot skills.