Sonic Underground (1999)

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