Sonic Underground

Sonic Underground

2002 - 2004, Animation, Kids
Sonic and his siblings search for their mother while being chased.

Episode Guide

  • Sonic Underground - Virtual Danger (Season 1 Episode 40)
    Season 1 Episode 40:

    Virtual Danger

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

  • Sonic Underground - The Pendant (Season 1 Episode 39)
    Season 1 Episode 39:

    The Pendant

    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.

  • Sonic Underground - The Art of Destruction (Season 1 Episode 38)
    Season 1 Episode 38:

    The Art of Destruction

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

  • Sonic Underground - Bartleby the Prisoner (Season 1 Episode 37)
    Season 1 Episode 37:

    Bartleby the Prisoner

    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.

  • Sonic Underground - Sleepers (Season 1 Episode 36)
    Season 1 Episode 36:


    On a mission in a far-away part of Robotropolis, the Hedgehogs are informed that freedom fighters have vanished and are going to be robotisized.

  • Sonic Underground - The Big Melt (Season 1 Episode 35)
    Season 1 Episode 35:

    The Big Melt

    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.

  • Sonic Underground - Sonia's Choice (Season 1 Episode 34)
    Season 1 Episode 34:

    Sonia's Choice

    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.

  • Sonic Underground - Healer (Season 1 Episode 33)
    Season 1 Episode 33:


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

  • Sonic Underground - Haircraft in Flight (Season 1 Episode 32)
    Season 1 Episode 32:

    Haircraft in Flight

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

  • Sonic Underground - Country of Crisis (Season 1 Episode 31)
    Season 1 Episode 31:

    Country of Crisis

    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.

  • Sonic Underground - Harmony of Something (Season 1 Episode 30)
    Season 1 Episode 30:

    Harmony of Something

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

  • Sonic Underground - New Echinda in Town (Season 1 Episode 29)
    Season 1 Episode 29:

    New Echinda in Town

    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.

  • Sonic Underground - Getting to Know You (Season 1 Episode 28)
    Season 1 Episode 28:

    Getting to Know You

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

  • Sonic Underground - No Hedgehog Is an Island (Season 1 Episode 27)
    Season 1 Episode 27:

    No Hedgehog Is an Island

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

  • Sonic Underground - Beginnings (Season 1 Episode 26)
    Season 1 Episode 26:


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

  • Sonic Underground - Flying Fortress (Season 1 Episode 25)
    Season 1 Episode 25:

    Flying Fortress

    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.

  • Sonic Underground - Six Is a Crowd (Season 1 Episode 24)
    Season 1 Episode 24:

    Six Is a Crowd

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

  • Sonic Underground - The Hedgehog in an Iron Mask (Season 1 Episode 23)
    Season 1 Episode 23:

    The Hedgehog in an Iron Mask

    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 Underground - Mummy, Dearest (Season 1 Episode 22)
    Season 1 Episode 22:

    Mummy, Dearest

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

  • Sonic Underground - Dunes Day (Season 1 Episode 21)
    Season 1 Episode 21:

    Dunes Day

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

  • Sonic Underground - Three Hedgehogs and a Baby (Season 1 Episode 20)
    Season 1 Episode 20:

    Three Hedgehogs and a Baby

    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 Underground - The Jewel of the Crown (Season 1 Episode 19)
    Season 1 Episode 19:

    The Jewel of the Crown

    Robotnik has his eyes set upon Queen Aleena's crown jewel, but Sonic, Manic and Sonia plan to retrieve the gem before Robotnik.

  • Sonic Underground - When in Rome ... (Season 1 Episode 18)
    Season 1 Episode 18:

    When in Rome ...

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

  • Sonic Underground - Head Games (Season 1 Episode 17)
    Season 1 Episode 17:

    Head Games

    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 Underground - Friend or Foe? (Season 1 Episode 16)
    Season 1 Episode 16:

    Friend or Foe?

    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.

  • Sonic Underground - Sonic Tonic (Season 1 Episode 15)
    Season 1 Episode 15:

    Sonic Tonic

    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.

  • Sonic Underground - Bug! (Season 1 Episode 14)
    Season 1 Episode 14:


    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.

  • Sonic Underground - Artifact (Season 1 Episode 13)
    Season 1 Episode 13:


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

  • Sonic Underground - A Hedgehog's Home Is Her Castle (Season 1 Episode 12)
    Season 1 Episode 12:

    A Hedgehog's Home Is Her Castle

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

  • Sonic Underground - Winner Fakes All (Season 1 Episode 11)
    Season 1 Episode 11:

    Winner Fakes All

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

  • Sonic Underground - Come Out Wherever You Are (Season 1 Episode 10)
    Season 1 Episode 10:

    Come Out Wherever You Are

    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.

  • Sonic Underground - The Last Resort (Season 1 Episode 9)
    Season 1 Episode 9:

    The Last Resort

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

  • Sonic Underground - Who Do You Think You Are? (Season 1 Episode 8)
    Season 1 Episode 8:

    Who Do You Think You Are?

    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.

  • Sonic Underground - The Deepest Fear (Season 1 Episode 7)
    Season 1 Episode 7:

    The Deepest Fear

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

  • Sonic Underground - Tangled Webs (Season 1 Episode 6)
    Season 1 Episode 6:

    Tangled Webs

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

  • Sonic Underground - Sonic Tangled (Season 1 Episode 6)
    Season 1 Episode 6:

    Sonic Tangled

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

  • Sonic Underground - Underground Masquerade (Season 1 Episode 5)
    Season 1 Episode 5:

    Underground Masquerade

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

  • Sonic Underground - The Price of Freedom (Season 1 Episode 4)
    Season 1 Episode 4:

    The Price of Freedom

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

  • Sonic Underground - Mobodoon (Season 1 Episode 3)
    Season 1 Episode 3:


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

  • Sonic Underground - To Catch a Queen (Season 1 Episode 2)
    Season 1 Episode 2:

    To Catch a Queen

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

  • Sonic Underground - Wedding Bell Blues (Season 1 Episode 1)
    Season 1 Episode 1:

    Wedding Bell Blues

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