1: Sonic Underground Beginnings (Origins, Part 1)

2: Sonic Underground To Catch a Queen

3: Sonic Underground Mobodoon

4: Sonic Underground The Price of Freedom

5: Sonic Underground Underground Masquerade

6: Sonic Underground Tangled Webs

7: Sonic Underground The Deepest Fear

8: Sonic Underground Who Do You Think You Are

9: Sonic Underground The Last Resort

10: Sonic Underground Come Out Wherever You Are

11: Sonic Underground Winner Fakes All

12: Sonic Underground A Hedgehog's Home Is Her Castle

13: Sonic Underground Artifact

14: Sonic Underground Bug!

15: Sonic Underground Sonic Tonic

16: Sonic Underground Friend or Foe?

17: Sonic Underground Head Games

18: Sonic Underground When in Rome...

19: Sonic Underground The Jewel of the Crown

20: Sonic Underground Three Hedgehogs and a Baby

21: Sonic Underground Dunes Day

22: Sonic Underground Mummy Dearest

23: Sonic Underground Hedgehog in the Iron Mask

24: Sonic Underground Six Is a Crowd

25: Sonic Underground Flying Fortress (Chaos Emerald Crisis, Part 1)

26: Sonic Underground Wedding Bell Blues

27: Sonic Underground No Hedgehog Is an Island (Chaos Emerald Crisis, Part 2)

28: Sonic Underground Getting to Know You (Origins, Part 2)

29: Sonic Underground New Echidna in Town (Chaos Emerald Crisis, Part 3)

30: Sonic Underground Harmony or Something (Origins, Part 3)

31: Sonic Underground Country Crisis

32: Sonic Underground Haircraft in Space

33: Sonic Underground Healer

34: Sonic Underground Sonia's Choice

35: Sonic Underground The Big Melt

36: Sonic Underground Sleepers

37: Sonic Underground Bartleby the Prisoner

38: Sonic Underground The Art of Destruction

39: Sonic Underground The Pendant

40: Sonic Underground Virtual Danger