Jaws is an antagonist-driven film, and you can see that represented in the logline with the antagonist given the recognition normally reserved for the protagonist. The antagonist, in this case, is the shark, and all the critical decisions spring from the antagonist’s actions. The protagonist and his two companions are always waiting for and reacting to an attack by the creature.

LOGLINE: Thriller/Suspense – When a gigantic great white shark begins to menace a small island community, a police chief, a marine scientist, and an old fisherman set out to stop it.

ACT ONE GOAL: Brody wants to close the beaches to protect the public, against the wishes of the local leaders.