Marty Sardini is the main antagonist of the fifth (and so far final) Freddi Fish game Freddi Fish 5: The Case of the Creature at Coral Cove

He is the developer of Coral Cove Park and cares more about his reputation rather than the safety of the townsfolk. He and a large mob of citizens are both mad, yet terrified, of a sea monster supposedly terrorizing the park.

It was later revealed that the monster was scaring the citizens because his home was taken and he had been driven out of the park by Marty. Fearing that his reputation would be ruined, he steals Xamfear's deed.  

After the heroes enter his basement, dodging his traps, they find the deed he had stolen. He denies there is such a deed. Eventually, the mayor arrests Marty for theft and high treason, and in the happy ending, Marty is stuck doing dirty work while the monster allows the townsfolk to play in the park.