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Episode 1
Beginnings (Origins, Part 1) -
Episode 2
To Catch a Queen -
Episode 3
Mobodoon -
Episode 4
The Price of Freedom -
Episode 5
Underground Masquerade -
Episode 6
Tangled Webs -
Episode 7
The Deepest Fear -
Episode 8
Who Do You Think You Are -
Episode 9
The Last Resort -
Episode 10
Come Out Wherever You Are -
Episode 11
Winner Fakes All -
Episode 12
A Hedgehog's Home Is Her Castle -
Episode 13
Artifact -
Episode 14
Bug! -
Episode 15
Sonic Tonic -
Episode 16
Friend or Foe? -
Episode 17
Head Games -
Episode 18
When in Rome... -
Episode 19
The Jewel of the Crown -
Episode 20
Three Hedgehogs and a Baby -
Episode 21
Dunes Day -
Episode 22
Mummy Dearest -
Episode 23
Hedgehog in the Iron Mask -
Episode 24
Six Is a Crowd -
Episode 25
Flying Fortress (Chaos Emerald Crisis, Part 1) -
Episode 26
Wedding Bell Blues -
Episode 27
No Hedgehog Is an Island (Chaos Emerald Crisis, Part 2) -
Episode 28
Getting to Know You (Origins, Part 2) -
Episode 29
New Echidna in Town (Chaos Emerald Crisis, Part 3) -
Episode 30
Harmony or Something (Origins, Part 3) -
Episode 31
Country Crisis -
Episode 32
Haircraft in Space -
Episode 33
Healer -
Episode 34
Sonia's Choice -
Episode 35
The Big Melt -
Episode 36
Sleepers -
Episode 37
Bartleby the Prisoner -
Episode 38
The Art of Destruction -
Episode 39
The Pendant -
Episode 40
Virtual Danger
Sonic Underground 1999
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.
