1 season available

Sonic Underground

TVY7AdventureAnimation • KidsActionFamilyTV Series • 2004

Sonic, Manic and Sonia continue their fight against Dr Robotnik to bring peace to Mobius.

Sonic, Manic and Sonia continue their fight against Dr Robotnik to bring peace to Mobius.

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1 season available (40 episodes)

1 season available

(40 episodes)

Episode 1

Wedding Bell Blues

Robotnik announces that he will marry Queen Aleena in a plot to become the king of Mobius.
Episode 2

To Catch a Queen

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.
Episode 3


Sonic, Sonia and Manic return to their birthplace, Mobodoon, a beautiful, festive town.
Episode 4

The Price Of Freedom

Sonia travels to east Mobius to visit her friend Mindy at the LaTour estate.
Episode 5

Underground Masquerade

Sleet and Dingo plan to collect the taxes owed to Robotnik from the Duke of Velcronia but keep it for themselves.
Episode 6

Tangled Webs

The sinister Robotnik blackmails Cyrus, an old friend of Sonic's, by holding his father hostage.
Episode 7

The Deepest Fear

On a trip to Port Mobius, Sonic, Manic and Sonia are told that ships are sinking due to the Mobian sea-beast.
Episode 8

Who Do You Think You Are

Queen Aleena's royal journals are rumored to be buried under a palace in the city of Tashistan.
Episode 9

Last Resort

While lost in the wastelands of Mobius, Sonic, Manic and Sonia stumble upon an oasis called Lake Valley Resort.
Episode 10

Come Out Wherever You Are

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.
Episode 11

Winner Fakes All

Robotnik organizes a track meet to lure Sonic into a trap.
Episode 12

A Hedgehog's Home is Her Castle

The Hedgehogs receive a message they believe is from their cousin.
Episode 13


The Hedgehogs steal historical artifacts of Mobuis from Robotnik before he can pawn them off at an auction.
Episode 14


A faction of the Freedom Fighters is wiped out by a swarm of metallic fly-bots.
Episode 15

Sonic Tonic

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.
Episode 16

Friend Or Foe

The Hedgehogs converge on the Floating Island, in their latest attempt to find their Mother.
Episode 17

Head Games

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.
Episode 18

When In Rome...

Sonic becomes frustrated that maybe all of their efforts of fighting for freedom seem futile.
Episode 19

The Jewel In The Crown

Robotnik has his sights set upon Queen Aleena's crown jewel, which glows as it is moved closer her.
Episode 20

Three Hedgehogs And A Baby

Sonic, Manic and Sonia find an abandoned baby in an alley and begin a search for the baby's parents.
Episode 21

Dunes Day

Sonic and his siblings travel to the outskirts of Mobius to recruit a tribe of nomads for the Resistance.
Episode 22

Mummy Dearest

Sonic, Manic and Sonia invade Robotnik's lair to retrieve the Hedgehog crest.
Episode 23

The Hedgehog in the Iron Mask

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.
Episode 24

Six Is A Crowd

The Oracle advises the Hedgehogs to undertake a mission which could reveal answers about their future.
Episode 25

Flying Fortress

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.
Episode 26


The history of the Underground is told in detail, from the fall of Mobotropolis to the rise of Robotnik.
Episode 27

No Hedgehog Is An Island

Sleet and Dingo escape the Flying Fortress with the Chaos Emerald.
Episode 28

Getting To Know You

The Hedgehogs begin to learn the important lessons of what it takes to be a freedom fighter.
Episode 29

New Echidna In Town

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.
Episode 30

Harmony or Something

Manic, Sonic and Sonia must end their training early when Robotnik threatens the Oracle and takes a member of the resistance hostage.
Episode 31

Country Crisis

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.
Episode 32

Haircraft In Space

Robotnik is using the local hairdresser, Doo-bot, to get information on the citizens that are against him.
Episode 33


A self proclaimed scientist has come to Robotropolis with a device that will reverse the effects of Robotnik's robotisizer.
Episode 34

Sonia's Choice

Robotnik has arranged a museum exhibit of the Royal family goblets.
Episode 35

The Big Melt

The Hedgehogs vacation is interrupted by the news of Robotnik's latest weapon.
Episode 36


On a mission in a distant sector of Robotropolis, the Hedgehogs are informed that freedom fighters have disappeared and are going to be robotisized.
Episode 37

Bartleby The Prisoner

Robotnik captures Bartleby and uses him as bait to capture Sonia.
Episode 38

The Art of Destruction

Robotnik's new weapon, Art, is the enforcer of Robotropolis new eradication policy.
Episode 39

The Pendant

The newly discovered Emerald Peninsula is a perfect place for Robotnik to add slaves to his empire.
Episode 40

Virtual Danger

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

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