Sonic Underground
Sonic finds a message in the sack from his mother urging him to head to Speedster Island.
Sonic finds a message in the sack from his mother urging him to head to Speedster Island.
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Sonic and Tails help a mermaid try to save her underwater city.
Robotnik lures Sonic into a round-the-planet vehicle race by threatening an orphanage.
Robotnik takes over a local amusement park called Mobiusland and changes the name to Robotnikland.
Robotnik shrinks Sonic and Tails with a shrink ray and puts them into his terrarium.
Sonic gets stuck with the job of baby-sitting three rambunctious baby groundhogs.
The Badniks go back to the Mesozoic Era and steal the Emerald of Life; Robotnik kills his Dumbniks.
Freedom Fighters are obliterated by a swarm of metallic fly-bots; Manic looks for the insects.
The Hedgehogs steal historical objects of Mobius from Robotnik.
The Hedgehogs discover that Sonia has inherited a castle; She basks in the idea of having a castle.
Robotnik organizes a track meet to lure Sonic into a trap.
Sonia is invited to a debutante ball, but she and her brothers must go on a mission first.
Sonic, Manic and Sonia stumble upon an oasis called Lake Valley Resort.
Queen Aleena's journals are buried in the city of Tashistan; Sonic and his siblings search the city.
Sonic, Manic and Sonia are told that ships are sinking due to the Mobian sea-beast.
Robotnik blackmails Cyrus by kidnapping his father and holding him hostage.
Sleet and Dingo plan to collect the taxes owed to Robotnik but keep it for themselves.
Robotnik launches a spy satellite in an effort to locate Knothole Village.
Sonic faces a dangerous vehicle during a solo mission to the Badlands.
Sonic is lured into a trap when a frustrated Robotnik announces a race.
Sonic and Sally encounter the Guardian while on a mission.
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