The newly reunited Sonic Siblings must learn to work as a team if they are to do battle with Robotnik. But do they really know each other well enough?
Sonic, Sonia and Manic put their training to the test as they embark on a mission to rescue the Oracle from Robotnik! Can they work together in harmony, or will their lacking seal their own doom?
When Robotnik announces he plans to marry Queen Aleena, the shocked sonic siblings race to the rescue, unaware it's a trap...
Sonic and Manic get addicted to a new video game so much that it is hindering Cyrus' plan to infiltrate Robotnik's base. But, when Sonic and Manic get sucked into the game, can they survive when they find out Robotnik is behind everything and ready to eliminate them?
Argus, the former captain of the Queen's guard, arranges a secret meeting with her. But he is soon intercepted by Robotnik's bounty hunters, Sleet and Dingo, who have every intention of feeding the soldier to the Roboticizer, the Sonic trio race to the rescue..
Evading Sleet and Dingo, the hedgehogs find themselves in a town completely untainted by Robotnik's hand, where the people are kind-hearted, and the food is free! Sounds like an ideal place, but there is more to Mobodoon than meets the eye. After using the Power Stone, the siblings discover that this is where they were born! Manic starts to become attached to this place so much so that he wants to stay. Is this the end of the Sonic Underground?
Sonia, after getting really dirty on one of her missions, flips out and drives off to East Mobius. There, Sonia is reunited with an old friend, Mindy LaTour, and her father. Mindy gives Sonia a watch. Unknown to Sonic's sister or Mindy though, the timepiece is a tracking device designed by Robotnik. Sonia finds out too late, and soon, Mindy's kingdom is swarming with similar wristwatch-style robots, all programmed to capture the hedgehogs! Can the siblings stomp out this bug problem?
Manic begins to backslide to his old ways when the gang discover a band of thieves led by Max. Meanwhile, Sleet and Dingo are plotting to avoid giving the taxes they are collecting to Robotnik. They only need someone to frame for a theft, and Manic is the perfect victim...
Sonic meets-up with his old friend Cyrus. While Sonic believes that Cyrus has joined the freedom fighters he is actually working for Dr. Robotnik. Until he finds out that the freedom fighters' "sanctuary" is for children. Sonic, Sonia, and Manic must now try to get him away from Robotnik.
Knuckles bargains with Robotnik in order to recover and repair the Chaos Emerald before Mobius is destroyed, but to acquire the villain's help, the echidna must betray the Hedgehogs...after rescuing his friends from the Roboticizer, Knuckles and the Sonic Underground must now combat Dingo, transformed by the chaos energy into a terrifying monster!
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