Sonic Underground
S01E13 Artifact
The Hedgehogs manage to snatch away some historical treasures from Robotnik just before he intends to sell them at an auction. Sonic and Sonia bring one of the artifacts to a university professor, who reveals that it’s actually a bomb dating back to the Mobian war. With urgency, the Hedgehogs realize they need to recover the bomb and safeguard the precious piece that holds the secrets of Mobius's history.
Season 1 Episodes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Beginnings (Origins, Part 1)
To Catch a Queen
Mobodoon
The Price of Freedom
Underground Masquerade
Tangled Webs
The Deepest Fear
Who Do You Think You Are
The Last Resort
Come Out Wherever You Are
Winner Fakes All
A Hedgehog's Home Is Her Castle
Artifact
Bug!
Sonic Tonic
Friend or Foe?
Head Games
When in Rome...
The Jewel of the Crown
Three Hedgehogs and a Baby
Dunes Day
Mummy Dearest
Hedgehog in the Iron Mask
Six Is a Crowd
Flying Fortress (Chaos Emerald Crisis, Part 1)
Wedding Bell Blues
No Hedgehog Is an Island (Chaos Emerald Crisis, Part 2)
Getting to Know You (Origins, Part 2)
New Echidna in Town (Chaos Emerald Crisis, Part 3)
Harmony or Something (Origins, Part 3)
Country Crisis
Haircraft in Space
Healer
Sonia's Choice
The Big Melt
Sleepers
Bartleby the Prisoner
The Art of Destruction
The Pendant
Virtual Danger