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Sonic Underground: 1x15
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. Robinik’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.
1 - 1Beginnings (Origins, Part 1) Aug. 30, 1999- 1 - 2To Catch a Queen Aug. 31, 1999
- 1 - 3Mobodoon Sep. 01, 1999
- 1 - 4The Price of Freedom Sep. 02, 1999
- 1 - 5Underground Masquerade Sep. 03, 1999
- 1 - 6Tangled Webs Sep. 06, 1999
- 1 - 7The Deepest Fear Sep. 07, 1999
- 1 - 8Who Do You Think You Are Sep. 08, 1999
- 1 - 9The Last Resort Sep. 09, 1999
- 1 - 10Come Out Wherever You Are Sep. 10, 1999
- 1 - 11Winner Fakes All Sep. 13, 1999
- 1 - 12A Hedgehog's Home Is Her Castle Sep. 14, 1999
- 1 - 13Artifact Sep. 15, 1999
- 1 - 14Bug! Sep. 16, 1999
- 1 - 15Sonic Tonic Sep. 17, 1999
- 1 - 16Friend or Foe? Sep. 20, 1999
- 1 - 17Head Games Sep. 21, 1999
- 1 - 18When in Rome... Sep. 22, 1999
- 1 - 19The Jewel of the Crown Sep. 23, 1999
- 1 - 20Three Hedgehogs and a Baby Sep. 24, 1999
- 1 - 21Dunes Day Sep. 27, 1999
- 1 - 22Mummy Dearest Sep. 28, 1999
- 1 - 23Hedgehog in the Iron Mask Sep. 29, 1999
- 1 - 24Six Is a Crowd Sep. 30, 1999
- 1 - 25Flying Fortress (Chaos Emerald Crisis, Part 1) Oct. 01, 1999
- 1 - 26Wedding Bell Blues Oct. 04, 1999
- 1 - 27No Hedgehog Is an Island (Chaos Emerald Crisis, Part 2) Oct. 05, 1999
- 1 - 28Getting to Know You (Origins, Part 2) Oct. 06, 1999
- 1 - 29New Echidna in Town (Chaos Emerald Crisis, Part 3) Oct. 07, 1999
- 1 - 30Harmony or Something (Origins, Part 3) Oct. 08, 1999
- 1 - 31Country Crisis Oct. 11, 1999
- 1 - 32Haircraft in Space Oct. 12, 1999
- 1 - 33Healer Oct. 13, 1999
- 1 - 34Sonia's Choice Oct. 14, 1999
- 1 - 35The Big Melt Oct. 15, 1999
- 1 - 36Sleepers Oct. 18, 1999
- 1 - 37Bartleby the Prisoner Oct. 19, 1999
- 1 - 38The Art of Destruction Oct. 20, 1999
- 1 - 39The Pendant Oct. 21, 1999
- 1 - 40Virtual Danger Oct. 22, 1999