Sonic, Sonia, and Manic are the children of Queen Aleena Hedgehog, the rightful ruler of Mobius, and are pursued relentlessly by Doctor Robotnik and his bumbling bounty hunters sidekicks, Sleet and Dingo. As infants, the siblings were separated and placed in hiding to fulfill a prophecy made by the Oracle of Delphius that the triplets would grow up to find their estranged mother, overthrow Robotnik, and take their places once more as Mobius' rightful rulers.
You can now watch Sonic Underground online on the following streaming providers in the United States.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Beginnings | 1999-08-30 | 30 min |
| Season 1 | Episode 2 | To Catch a Queen | 1999-08-31 | 30 min |
| Season 1 | Episode 3 | Mobodoon | 1999-09-01 | 30 min |
| Season 1 | Episode 4 | The Price of Freedom | 1999-09-02 | 30 min |
| Season 1 | Episode 5 | Underground Masquerade | 1999-09-03 | 30 min |
| Season 1 | Episode 6 | Tangled Webs | 1999-09-06 | 30 min |
| Season 1 | Episode 7 | The Deepest Fear | 1999-09-07 | 30 min |
| Season 1 | Episode 8 | Who Do You Think You Are | 1999-09-08 | 30 min |
| Season 1 | Episode 9 | The Last Resort | 1999-09-09 | 30 min |
| Season 1 | Episode 10 | Come Out Wherever You Are | 1999-09-10 | 30 min |
| Season 1 | Episode 11 | Winner Fakes All | 1999-09-13 | 30 min |
| Season 1 | Episode 12 | A Hedgehog's Home Is Her Castle | 1999-09-14 | 30 min |
| Season 1 | Episode 13 | Artifact | 1999-09-15 | 30 min |
| Season 1 | Episode 14 | Bug! | 1999-09-16 | 30 min |
| Season 1 | Episode 15 | Sonic Tonic | 1999-09-17 | 30 min |
| Season 1 | Episode 16 | Friend or Foe | 1999-09-20 | 30 min |
| Season 1 | Episode 17 | Head Games | 1999-09-21 | 30 min |
| Season 1 | Episode 18 | When in Rome ... | 1999-09-22 | 30 min |
| Season 1 | Episode 19 | The Jewel in the Crown | 1999-09-23 | 30 min |
| Season 1 | Episode 20 | Three Hedgehogs and a Baby | 1999-09-24 | 30 min |
| Season 1 | Episode 21 | Dunes Day | 1999-09-27 | 30 min |
| Season 1 | Episode 22 | Mummy Dearest | 1999-09-28 | 30 min |
| Season 1 | Episode 23 | The Hedgehog in the Iron Mask | 1999-09-29 | 30 min |
| Season 1 | Episode 24 | Six Is a Crowd | 1999-09-30 | 30 min |
| Season 1 | Episode 25 | Flying Fortress | 1999-10-01 | 30 min |
| Season 1 | Episode 26 | Wedding Bell Blues | 1999-10-04 | 30 min |
| Season 1 | Episode 27 | No Hedgehog Is an Island | 1999-10-05 | 30 min |
| Season 1 | Episode 28 | Getting to Know You | 1999-10-06 | 30 min |
| Season 1 | Episode 29 | New Echidna in Town | 1999-10-07 | 30 min |
| Season 1 | Episode 30 | Harmony or Something | 1999-10-08 | 30 min |
| Season 1 | Episode 31 | Country Crisis | 1999-10-11 | 30 min |
| Season 1 | Episode 32 | Haircraft in Space | 1999-10-12 | 30 min |
| Season 1 | Episode 33 | Healer | 1999-10-13 | 30 min |
| Season 1 | Episode 34 | Sonia's Choice | 1999-10-14 | 30 min |
| Season 1 | Episode 35 | The Big Melt | 1999-10-15 | 30 min |
| Season 1 | Episode 36 | Sleepers | 1999-10-18 | 30 min |
| Season 1 | Episode 37 | Bartleby the Prisoner | 1999-10-19 | 30 min |
| Season 1 | Episode 38 | The Art of Destruction | 1999-10-20 | 30 min |
| Season 1 | Episode 39 | The Pendant | 1999-10-21 | 30 min |
| Season 1 | Episode 40 | Virtual Danger | 1999-10-22 | 30 min |
| Production | Andy Heyward | Producer |
