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Watch Sonic Underground online: Episode 21 The Jewel in the Crown

Robotnik has his sights set upon Queen Aleena's crown jewel, which glows as it is moved closer to her. Sonic, Manic and Sonia plan to recover the jewel from the merchant owner before Robotnik, not only to find their mother, but to protect her as well. The Hedgehogs acquire the jewel and begin their search, the glow becomes more radiant the closer they travel to their destination and their hopes of finding the Queen seem to be a tangible reality. The trio arrive to the place where the glow is at its brightest only to find that the jewel was only a decoy intended to lure Robotnik into a trap.

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