Voice Credits
Sonic, Manic, & Sonia - Jaleel White
Dr. Ivo Robotnik - Gary Chalk
Sleet - Maurice LaMarche
Dingo - Peter Wilds
Cyrus & Knuckles - Ian James Corlett
Queen Aleena - Gail Webster
Singing Voice - Samuel Vincent
Singing Voice - Phil Hayes
Singing Voice - Tyley Ross
Singing Voice & Mindy LaTour - Louise Vallance
Grandfather Athair - Sean Connery (uncredited)
  

Robotnik announces that he will marry Queen Aleena in a plot to become the king of Mobius. Upon hearing the alarming news, Sonic, Manic and Sonia become suspicious that the wedding may be a trap and decide to investigate. The hedgehogs, aided by Bartleby, are hired to play music for the ceremony. Disguised as 18th century musicians, Sonic and his siblings crash the wedding hoping to find the Queen and bring to light this most obvious sham.
Song - When Tomorrow Comes
  

Argus, a captain of the queens guard, is captured by Sleet and Dingo before he can reach the secret rendezvous where he was to meet Queen Aleena. While listening to a scanned radio message, Sonic, Manic and Sonia overhear that a queen's guard has been captured and robotisized. The hedgehogs then begin their pursuit to recapture captain Argus from Robotnik and get the information revealing the secret meeting place where they may be reunited with their beloved mother.
Song - Have You Got the 411
  

Sonic, Sonia and Manic return to their birthplace, Mobodoon, a beautiful, festive town. The homecoming is interrupted when Sleet and Dingo arrive to collect back taxes by order of Doctor Robotnik. Because Mobodoon has no form of currency to pay this bogus debt, Sleet and Dingo decide to raid the village and steal its most precious monuments, including the powerstone, which is the centre of Mobodoon's vitality. It is up to the Hegdehog's to get the powerstone back and restore their former home to its previous blissful state.
Song - I've Found My Home
  

Sonia travels to east Mobius to visit her friend Mindy at the LaTour estate. After being given a watch by her friend Mindy, Sonia discovers that these peculiar timepieces are really monitoring devices for the Robotnik Intelligence Agency and are mass produced by Mindy's father Mr LaTour. Sonia, Sonic and Manic confront Mindy and LaTour with this discovery. Realising the error of his ways, Mr LaTour ends production and decides to flee with his daughter. The Hedgehogs skilfully put the spy devices to their own use to help the LaTours escape.
Song - Money Can't Buy
  

Sleet and Dingo plan to collect taxes owed to Robotnik from the Duke of Velcronia but keep it to themselves. To avoid the wrath of Robotnik, Sleet and Dingo infiltrate the Underground to corral manic and friends to commit the crime and take the blame. The scheme is moving along well for the evil duo until they are caught on tape by Max, Manic's friend, who stop the deviant Sleet and Dingo enabling the duke to keep his money.
Song - Let The Good Times Roll
  

The sinister Robotnik blackmails Cyrus, an old friend of Sonic's, by holding his father hostage. Robotnik makes Cyrus gain the hedgehogs trust and then has Cyrus convince them to save his father. Cyrus reluctantly informs Robotnik of the rescue plan so Robotnik can devise a trap for the Hedgehogs. However, once Cyrus sees the hedgehogs helping the kids of Mobius, he realises assisting in the capture of the hedgehogs is a bad idea, Cyrus helps the hedgehogs and in the process they destroy another of Robotnik's swat-bot factories.
Song - The Children Light the Way
  

On a trip to Port Mobius, Sonic, Manic and Sonia are told that ships are sinking due to the Mobian sea-beast. The legendary story becomes fishy when the Hedgehogs meet Captain Squeege who informs them of a scam in which townspeople must rely on Robotnik for protection from the sea monster, when in reality it is Robotnik who is sinking ships, not a monster. Sonic must overcome his fear of water and the monster to find the truth and thereby ending the fears of the sea side town.
Song - Face Your Fear
  

Queen Aleena's royal journals are rumoured to be buried under a palace in the city of Tashistan. As Sonic and his siblings scour the city in search of the scrolls, Sonia gets into trouble, causing her to lose her memory. She then gets into more trouble when she sells her power medallion to a local merchant. A young boy from the village makes an attempt to keep Sonia safe, but the two are captured. Sonic and manic must then work together to retrieve the power medallion, locate the journals and find the one thing that is most precious to them, Sonia.
Song - We Need To be Free
  

While lost in the wastelands of Moius, Sonic, Manic and Sonia stumble upon an oasis called Lake Valley Resort. Although Sonic is impressed with it's beauty, he has a sinking feeling that this village may be under the scope of Robotnik's radar. Sonic's doubts are confirmed when he overhears Stripes informing Robotnik that the Resistance is in town. After Sleet and Dingo attack the lovely village, the Hedgehog's take a stand and show the village that being part of the Resistance and fighting for good is far greater than making deals with those who do evil.
Song - Listen To Your Heart
  

Sonia is invited to a debutante ball, but before she can be officially announced to society, she and her brothers, Manic and Sonia have an important missions. Robotnik has constructed an evil weapon that will capture and robotisize all members of the resistance all over the world. The Underground must hijack this weapon and insert a deactivating device before the brain of the vehicle in installed. Sonia daydreams and is caught while executing part of the missions. Sonic aids Sonia to help her focus on their mission and still make an appearance at the ball.
Song - Society Girl
  

Robotnik organises a tack meet to lure Sonic into a trap, he's sure that Sonic will not sit out on a challenge of speed. Sonia and Manic are also aware of Sonic's competitive nature and advise Sonic not to enter the event due to the risk that he may be caught. When Sonia and manic cannot find Sonic, they head to the race to rescue him. Surprisingly Sonic does not enter the race, but finds himself involved in a more challenging test of speed, a race to save his brother and sister.
Song - Built for Speed
  

The Hedgehogs receive a message they believe is from their mum. In the message a castle is left to Sonia, who revels in the idea of having a castle for the Underground headquarters. Sonic, manic and Sonia arrive at the castle only to see an old, dark dilapidated structure. Inside the castle, the hedgehogs all have separate meetings with a mysterious apparition who resembles their mother. Sonic, Manic and Sonia discover the message and the castle are all part of a trap, and utilising the power of Queen Aleena devise a plan to escape.
Song - Let's Do It To It
  

The Hedgehogs steal historical artefacts of Mobius from Robotnik before he can pawn them off at an auction. Sonic and Sonia take one of the pieces to a university professor who informs them that the artefact is actually a bomb from the Mobian war. While his brother and sister are discovering the artefacts origin, Manic sells his piece to a black-market salesman for cash, who then sells it to Bartleby, and suddenly a bomb has fallen into innocent hands. The Hedgehogs must act fast to retrieve the bomb and protect the treasures that are the key to Mobius's past.
Song - You Can't Own Everything
  

A faction of Freedom Fighters are wiped out by a swarm of metallic fly-bots. When Manic goes in search of the insects he is stung with a serum, making him loyal to Robotnik. Sonia finds Manic communicating a radio message to Robotnik and realises her brother is under a spell. It's up to Sonic to exterminate the metallic pests.
Song - Never Give Up
  

A speed enhancing fluid deemed "Sonic Tonic" is created by Doctor Robotnik to make him as fast as Sonic. Robotnik's plan is successful and Sonic is captured, yet when Dingo begins to feel the side effects of the tonic, Sonic is able to make a run for it with a vial of the tonic in tow. Unaware of the side effects of the tonic, Manic and Sonia, envious of Sonic's speed, decide to use the tonic on themselves. When the effects of the fluid take hole it renders them immobile and they must rely on their brother to get them out of trouble.
Song - The Fastest Thing Alive
  

The Hedgehogs converge on the Floating Island, in their latest attempt to find their Mother. Sleet and Dingo also have an interest in the island that involves the Chaos Emeralds, which is the island's life-force. But, before either party can achieve their goals, they have to get through Knuckles, the floating islands stern guardian. Knuckles is even sceptical of Sonic's motives, although he can see right through Sleet and Dingo. Once the hedgehogs convince Knuckles they are friendly and mean no harm to his island, they help Knuckles in protecting his exotic home and the emerald.
Song - Not Always What They Seem
  

As Sonic begins to chow chilli dogs for a snack, he find a message in the sack from his mother urging him to head to Speedster Island. When he and his siblings arrive they encounter an ancient sanctuary about to be overrun by Robotnik and sold off bit by bit. The hedgehog's must persuade Bartleby to end his deal to build a resort on the beautiful island and save the people of the village from becoming slaves.
Song - Take a Chance
  

Sonic becomes frustrated that maybe all of their efforts of fighting for freedom seem futile. Sonia suggests that they go to visit the Oracle, their spiritual guide, to put everything into perspective. The Oracle makes a deal with the hedgehogs, stating that if they can complete this next mission he will reveal their future. Instead upon arrival in the ancient city they discover that their power medallions are missing and they are powerless. Sonic, Manic and Sonia must use their natural powers to save this civilisation from the evil ruler. They learn that by relying on faith in themselves they can overcome obstacles and achieve their goals.
Song - Where There's a Will There's a Way
  

Robotnik has his sights set upon Queen Aleena's crown jewel, which glows as it is moved closer to her. Sonic, Manic and Sonia plan to recover the Jewel from the merchant owner before Robotnik, not only to find their mother but to protect her as well. The Hedgehogs acquire the jewel and begin their search, the glow leading them towards their destination and raising their hoped of finding the queen. The trio arrive to the place where the glow was at it's brightest only to learn that the jewel was only a decoy intended to lure Robotnik into a trap.
Song - The Cosmic Dance
  

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 shelter as Sonic and Sonia ordered, that 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. Sonic and Sonia frantically search for their brother before he unknowingly exposes the location of the secret sanctuary.
Song - Being a Kid is Cool
  

Sonic and his siblings travel to the outskirts of Mobius to recruit a tribe of nomads for the Resistance. The Hedgehog's van breaks down and they are saved by the Tribesmen. Once they return to the camp, Manic discovers, that the chief has been robotisized, which is a secret that could have the chief banished from the tribe. Manic is then captured and taken from the camp, unbeknownst to Sonic, Sonia and the chief. Sonia and Sonic get to the bottom of why their brother is missing and rush to find him before it is too late.
Song - True Blue Friend
  

Sonic, Manic ad Sonia invade Robotnik's lair to retrieve the Hedgehog crest. After the book is reclaimed they discover that this book contains directions to a scroll that could be important to overthrow Robotnik. The scroll is heavily protected, but Sonic leads the group in the right direction where they eventually encounter the royal Aman-Rapi, who once awakened demands the price of a song in exchange for the scroll.
Song - We Are Sonic Underground
  

The Hedgehogs latest quest takes them to the prison tower where they encounter a masked stranger who insists he is family. This stranger is actually bit for another attempt by Robotnik to capture them. The stranger creates a rift between the siblings, which leaves the Underground disbanded, vulnerable and ultimately trapped. The Hedgehogs must find a way to escape the prison walls that held their mother captive many years ago.
Song - Part of the Problem.
  

The Oracle advises the Hedgehogs to undertake a mission which could reveal answers about their future. Sonic, Manic and Sonia are thrown into a universe that almost seems to parallel their own, however in this dimension they are not the Underground but the evil rulers of Mobius. Confused by this world they begin to explore and suddenly find themselves confronted by a corrupted version of themselves.
Song - I Can Do That For You.
  

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. Sonic investigates the ship thinking the weapon can be destroyed by removing it's reactor, however his efforts fail and he goes to Knuckles for help, because he believes the weapon is powered by a Chaos Emerald. Knuckles agrees to aid him suppressing the fear that the Floating Island will be left unprotected. Knuckles and Sonic locate the power source only to have it taken by Sleet and Dingo before the Hedgehogs can reach it.
Song - No One Is An Island
  

Continued from Flying Fortress
Sleet and Dingo escape the Flying Fortress with the Chaos Emerald, in a fight over who will control the Emerald's power Sleet and Dingo drop and break the Emerald in two. Instantly a rash of earthquakes and other natural disasters are sparked by the emerald's energy. Knuckles and the Hedgehogs turn to a relative of Knuckles for the answers of how to stop Mobius being slowly devoured by the emerald's force and find that the only solution to end the obliteration of Mobius is to make a deal with their arch rival Robotnik.
Song - Learn to Overcome
  

Continued from No Hedgehog Is An Island
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. Knuckles soon regrets that he ever trusted the evil dictator after Robotnik begins to follow through his plans to robotisize the hedgehogs. Once Knuckles saves his friends from doom, a larger challenge is waiting for them. Dino has swallowed an emerald and is now a giant monster creating havoc all over the planet. The hedgehogs and Robotnik have to stop the mutant creature before Mobius falls into Certain oblivion.
Song - The Mobius Song
  

The history of the Underground is told in detail, from the fall of Mobotropolis to the rise of Robotnik. Included is the prophecy, as told by the Oracle of Delphius, that caused Queen Aleena to give up her children so that all people of Mobotropolis could one day be redeemed. As the Queen's children grow and witness tragedy all around them they soon learn that they are not alone in their urge to fight Robotnik's evil, they have each other, and that fighting for freedom is not only their duty, but their destiny.
Song - Someday
  

Continued from Begginings
The Hedgehogs begin to learn the important lessons of what it takes to be a freedom fighter. The Oracle provides teachers to guide Sonic, Manic and Sonia to develop the necessary skills to recognize the power that comes from within. The Hedgehogs also discover the hidden magical force of the power medallions as they grow to understand that teamwork will serve them best in averting the dangers that await them.
Song - Working Together in Harmony
  

Continued from Getting To Know You
Manic, Sonic and Sonia must end their training early when Robotnik threatens the Oracle and takes a member of the resistance hostage. During the rescue mission the Hedgehogs fall into trouble and begin to place blame on each other for everything that has gone awry. Queen Aleena then intervenes with an important message for her children that they must learn to work together and derive strength from their willingness to help others.
Song - We're all in this together
  

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. In the meantime Robotnik is able to build a dam that is dangerous to the peoples land, and the resistance cannot work together to end the construction. Sonic, Manic and Sonia use the power of music to settle the feud.
Song - Down on the Byou
  

Robotnik is using the local hairdresser, Doo-bot to get information on the citizens that are against him. Sonia becomes a victim of Doo-bots trance during a shampoo and divulges important information that could lead Robotnik to their secret base. The Hedgehogs learn that the Doo-bot is equipped with a recording device and dash to retrieve the tape from the Doo-bot before the secret location is disclosed.
Song - Don't Be a Backstabber
  

A self proclaimed scientist has come to Robotropolis with a device that will reverse te effects of Robotnik's robotisizor. Sonic, Manic and Sonia attend a demonstration of this where Sonia decides she can use it to help her rescue a friend. Sonic, on the other hand is sceptical that the machine is the real thing and decides to investigate. Robotnik kidnaps the inventor and forces him to confess that he is a hoax. Robotnik will spare his life only if he agrees to use his machine as a robotisizer. Sonic learns of this deal and quickly rescues Sonia before she becomes Robotnik's next victim.
Song - Sonic Underground (Rock Version).
  

Robotnik has arranged a museum exhibit of the Royal family goblets. Knowing that Sonic, Sonia and Manic will want to reclaim their family treasures, he expects the heirlooms with serve the perfect bait to finally capture he hedgehogs. Sonic and his siblings are aware that this is a trap but devise a counter plan of their own to avoid getting caught. The hedgehogs mission falls apart when Sonic and Manic are taken prisoner and Sonia must choose between which brother she should risk rescuing from the robotization chamber first, Manic or Sonic.
Song - Never Easy.
  

The Hedgehogs vacation is interrupted by the news of Robotnik's latest weapon. Sonic, Manic and Sonia must travel to the arctic where the weapon is located. They are shocked as the submarine melts the icy landscape from under their feet. The Hedgehogs then scurry to locate the lethal submarine before the entire planet is completely submerged underwater.
Song - Fun In the Sun.
  

On a mission in a distant sector of Robotropolis, the Hedgehogs are informed that freedom fighters have disappeared and are going to be robotisized. Sonic races to save his friends but he is too late. The group of freedom fighters have been robotisized include Cyrus's father who had been constructing potent sleeper bombs that enable Robotnik to capture a vital portion of the resistance.
Song - Have It All.
  

Robotnik captures Bartleby and uses him as bait to capture Sonia. While the Hedgehogs are busy sealing Robotnik's mining operation, Sonia slips away to aid her friend in need. Once Sonic and Manic seal off the mines, they become aware that their sister is missing and race to save Bartleby and Sonia.
Song - Justice Calling.
  

Robotnik's new weapon, Art, is the enforcer of Robotropolis new eradication policy. Art's objective is to destroy everything in sight, including Sonic, Manic and Sonia. The giant mechanical beast is seemingly unstoppable until he overhears the musical melodies of the Undergorund band. The music tames the savage beast and the Hedgehogs take advantage of this sudden change in the robots mood and turns Robotnik's new robot against him.
Song - Sound of Freedom.
  

The newly discovered Emerald Peninsula is a perfect place for Robotnik to add slaves to his empire. Sonic, Sonia and Manic are alerted of Robotnik's plan to transplant the peninsula's inhabitants and turn to a fortune teller for help. The mystic advises Sonia of a pendant that could reveal the answer to stopping Robotnik. One half of the pendant is discovered, but Sonia suddenly has a reaction from the pendant's side effects. Sonic and Manic must quickly find the other half to save their sister before she disappears.
Song - Liberty Rocks.
  

Sonic and Manic play a game of virtual reality to enhance their pilot skills. When the two brothers decide to put their practices to use, they fly in a successful mission that intercepts a supply ship from Robotnik. To put the Hedgehogs game to an end Robotnik decides to invade the simulated world and provoke a less than successful outcome for Sonic and Manic. Once the virtual danger becomes a reality, it's up to Sonia to play the game to save her brothers.
Song - Keep Your Guard