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Sonic UndergroundThe sinister Robotnik blackmails Cyrus, an old friend of Sonic's, by holding his father hostage.

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Now PlayingSonic UndergroundThe sinister Robotnik blackmails Cyrus, an old friend of Sonic's, by holding his father hostage.Restart available0Sonic UndergroundOn a trip to Port Mobius, Sonic, Manic and Sonia are told that ships are sinking due to the Mobian sea-beast.