Sonic Underground
S01E23 Hedgehog in the Iron Mask
On their latest adventure to locate their mother, the Hedgehogs arrive at a prison tower, where they meet a masked figure claiming to be part of their family. However, this individual is merely a pawn in Robotnik's ongoing scheme to ensnare them. His presence sows discord among the siblings, leading to the disbandment of the Underground. As a result, they find themselves exposed and ultimately cornered.
Season 1 Episodes
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3
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9
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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