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Terror From the Deep is the fifth and final Challenge Act of Seaside Hill Act 2 in the console/PC version of Sonic Generations. It is unlocked after clearing every Stage in the Dreamcast era and is playable only as Modern Sonic.
In this Challenge Act, the player takes control of Modern Sonic in Seaside Hill Act 2, where they have to get to the goal within a given time limit. However, the route the character takes is altered slightly so that they travel on water more often, leaving them vulnerable to getting swallowed by the Mega Chopper if they overstep the boundaries set by the Buoy.