Sonic Underground

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

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.

A captain of the Queen's guard is captured 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.

The Hedgehogs begin to learn the important lessons of what it takes to be a freedom fighter.

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

Manic, Sonic and Sonia must end their training early when Robotnik threatens the Oracle and takes a member of the resistance hostage.

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

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

The history of the Underground is told in detail, from the fall of Mobotropolis to the rise of Robotnik.

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

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

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

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.

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

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.

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

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

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

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.

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.

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

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

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

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.

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

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

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

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.

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

Sonic, Manic and Sonia find a book that contains directions to a scroll that might be an important tool to defeat Robotnik.

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.

The Hedgehogs latest mission to find their mother takes them to the prison tower, where they come across a masked stranger who insists he is family.

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.

The Oracle advises the Hedgehogs to take on an assignment that could disclose answers about their future.

Sonic, Manic and Sonia find an abandoned baby in an alley and begin a search for the baby's parents.

What is believed to be a vacation for Sonic, Manic and Sonia turns into a battle to rescue Mobius when Robotnik strikes with his newest weapon.

The story of the Underground is told, from the fall of Mobotropolis to the ascent of Robotnik.

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.

Sleet and Dingo flee the Flying Fortress with the Chaos Emerald, which they drop and break in half.

The Hedgehogs start to learn the significant lessons of what it takes to be a freedom fighter; the Oracle supplies teachers to guide them.

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.

Knuckles grudgingly makes a deal with Robotnik to hand over Sonic and his kin in exchange for finding the Chaos Emerald that will save Mobius.

Manic, Sonic and Sonia have to end their training early when Robotnik threatens the Oracle and takes a member of the resistance prisoner.

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

Queen Aleena advises the Hedgehogs to journey to a valley so that they can bring about harmony between two parties of the resistance that have separated.

Robotnik is using the resident hairdresser, Doo-bot, to get information on the civilians who are opposed to him.

A self-proclaimed scientist has come to Robotropolis with a tool that will undo the effects of Robotnik's roboticizer.

Robotnik has assembled a museum exhibit of the royal family goblets, which he presumes will serve as perfect bait to capture the Hedgehogs at last.

The Hedgehogs' vacation is cut short by the news of Robotnik's newest weapon; they must journey to the arctic where the weapon is located.

On a mission in a faraway part of Robotropolis, the Hedgehogs are informed that freedom fighters have vanished and are going to be robotized.

Robotnik captures Bartleby and uses him as bait to imprison Sonia; while the Hedgehogs are occupied, Sonia sneaks away to assist her friend in need.

Robotnik's new weapon, Art, is the enforcer of Robotropolis' new eradication policy; Art's purpose is to obliterate everything in sight.

The newly discovered Emerald Peninsula is a perfect location for Robotnik to add slaves to his domain; the Hedgehogs turn to a fortune-teller for guidance.

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.

Sonic and Manic participate in a game of virtual reality to improve their pilot skills.

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