Sewer Shark is a notable full-motion video (FMV) rail shooter developed for the Sega CD. Set in a dystopian future where humans are forced to inhabit underground tunnels, the game involves manning a craft known as the Sewer Shark to exterminate mutated rat-alligator hybrids, or "ratigators". The primary gameplay revolves around manipulating a crosshair to eliminate targets and occasionally altering course. Successful eradication of the infestation promises a one-way journey to the sun-soaked Solar City.
Sewer Shark is an FMV-based shooter, and one of the first games released for the Sega CD. You move a crosshair around the screen and shoot targets. Occasionally, you can also choose to change directions at fixed points.
Of course the real attraction in a game like this is the story. In the future, maybe in the year 2000, people will be forced to move underground and live in tunnels. Unfortunately, these tunnels are infested with mutated rat / alligator creatures known as "ratigators." You are pilot of a Sewer Shark, a craft designed to navigate the Sewers and rid them of ratigators. It's a dangerous job, but if you clear out enough vermin you can win a one-way trip to Solar City and sunny beaches.