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The following is a list of episode summaries for the Sonic Underground television series. It first premiered in France on January 6, 1999 and aired on TF1 on the TF! Jeunesse block on Wednesdays and Sundays. The show later premiered in English in the UK on May 2, 1999 and aired on ITV1 on Sunday mornings. ITV1 aired the first 18 episodes in the original UK run before cancelling the show. Sonic Underground premiered in USA on August 30, 1999 and aired on the Bohbot Kids Network syndication block on weekday mornings at 6:00 AM Central Time.

While it was believed for a while that 65 episodes were made of which only 40 aired (since there were supposedly 65 planned), Ben Hurst, a main writer from Sonic the Hedgehog, who was also involved in Sonic Underground's production, stated in a chat at the Sonic Amateur Games Expo 2008 that only 40 were produced.

Season 1[]

01 - 01. Beginnings

01 - 02. Wedding Bell Blues

01 - 03. To Catch a Queen

01 - 04. Mobodoon

01 - 05. The Price of Freedom

01 - 06. Underground Masquerade

01 - 07. Tangled Webs

01 - 08. The Deepest Fear

01 - 09. Who Do You Think You Are

01 - 10. The Last Resort

01 - 11. Come Out Wherever You Are

01 - 12. Winner Fakes All

01 - 13. A Hedgehog's Home is Her Castle

01 - 14. Artifact

01 - 15. Bug!

01 - 16. Sonic Tonic

01 - 17. Friend or Foe?

01 - 18. Head Games

01 - 19. When in Rome...

01 - 20. The Jewel of the Crown

01 - 21. Three Hedgehogs and a Baby

01 - 22. Dunes Day

01 - 23. Mummy Dearest

01 - 24. Hedgehog in the Iron Mask

01 - 25. Six is a Crowd

01 - 26. Flying Fortress

01 - 27. No Hedgehog is an Island

01 - 28. Getting to Know You

01 - 29. New Echidna in Town

01 - 30. Harmony or Something

01 - 31. Country Crisis

01 - 32. Haircraft in Space

01 - 33. Healer

01 - 34. Sonia's Choice

01 - 35. The Big Melt

01 - 36. Sleepers

01 - 37. Bartleby the Prisoner

01 - 38. The Art of Destruction

01 - 39. The Pendant

01 - 40. Virtual Danger

Season 2[]

02 - 01. Miles "Tails" Prower is Back!

02 - 02. Sally Acorn's Here!

02 - 03. Sonic's Star Rock

02 - 04. Welcome Back Knuckles!

02 - 05. Manic's Bass-Drums Power Up

02 - 06. You Go, Sonia!

02 - 07. Tails' Singing Star

02 - 08. Sonic's Power Ring Returns

02 - 09. Dancing with the Mobius

02 - 10. Sally's Magical Music Star

02 - 11. Let's Road!

02 - 12. Knuckles at the Under-Holes

02 - 13. Manic's Got the Green-Power

02 - 14. Sonia and Sally's Wonderful Vacation

02 - 15. A Sonic Day Afternoon

02 - 16. Tails' Good Day

02 - 17. Sally at the Fashion Show

02 - 18. Sonic at the Mystic Mansion

02 - 19. Battle of the Boy Music

02 - 20. Knuckles and the Secret Emeralds

02 - 21. Chez Sonia

02 - 22. Manic's Lighting Thunder Crush

02 - 23. Sonic at the Wild Adventure

02 - 24. Girls Day Out

02 - 25. Tails' Lesson to the Rhythm

02 - 26. At the Hop

02 - 27. Thanks to Amy

02 - 28. Sally's Mission Competed

02 - 29. Sonic, Tails and Knuckles in the Three Musketeers

02 - 30. Knuckles' Weight Traning

02 - 31. Sonic and Tails and the Sidekick

02 - 32. Sonia's Dance Style

02 - 33. Manic's Cooler Bands

02 - 34. Sally and the Shiny Crystals

02 - 35. Tails at the Workshop

02 - 36. Rhythm of the Night

02 - 37. Knuckles and the Fireballs

02 - 38. Sonic, Sonia and Manic's Big Adventure

02 - 39. Sonic VS. Doctor Robotnik

02 - 40. Sonic and Friends Saves the Day

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