The Utah community of Santa Ynez is being terrorized by a mysterious black coupe that appears out of nowhere and begins running people down. After the car kills off the town sheriff, Captain Wade Parent is determined to stop the murderous driver.

Frederick is a young medieval French prince with magical powers, turned into a frog by his evil sorceress aunt, who kills his father in a bid to seize the throne. After being pursued by his aunt, the prince is saved by the Loch Ness Monster, who indebts herself to him, and hides out with a colony of anthropomorphic frogs for a time. After ultimately deciding to accept his fate and fight evil using his powers, Freddie grows to the size of an adult human, travels to the future, and becomes a French secret agent with a sentient car.