Sonic Underground (1999)

S1E7 The Deepest Fear

Title: The Deepest Fear Plot: While visiting Port Mobius, Sonic, Manic, and Sonia learn about a terrifying sea creature that is causing ships to disappear. Their investigation takes a turn when they encounter Captain Squeegee, who reveals that the townspeople are being tricked into believing they need Robotnik's protection from the supposed beast. In reality, Robotnik is the one orchestrating the shipwrecks. To uncover the truth and free the town from its fears, Sonic must confront his own dread of water and the imagined monster lurking beneath the waves.