The Island of Dr. Moreau

Three men are adrift after the Lady Vain wrecks in the Pacific. One dies at sea, leaving Braddock and another survivor. After seventeen days at sea, they reach a desolate island where their fragile hope of safety begins to unfold.

The remaining survivor reaches the island, but the other man is killed by animals. Braddock is taken to a hidden compound governed by Dr. Moreau, who nurses him back to health and begins his unnerving regimen.

Braddock is introduced to Moreau's associates—Montgomery, M'Ling, and Maria—and is warned not to venture outside at night. He soon learns the island houses more than a single captive: a menagerie of hybrids created by Moreau's experiments.

Inside a cavern, the hybrid 'Sayer of the Law' recites the three rules: no going on all fours, no eating human flesh, and no taking life. A Lion-Man attacks Braddock; Montgomery subdues him and hauls him toward the House of Pain for punishment.

Moreau defends his methods, arguing that compassion is a weakness. He injects the Lion-Man to push his 'humanization' process, demonstrating the brutal cost of the transformations.

An animal-advocate Bull-Man defies the laws by killing a tiger. Braddock later finds the tiger in the jungle, badly wounded and begging for death; he shoots it to end its suffering, thereby breaking the law and angering the man-beasts.

Braddock decides to flee with Maria, hoping to escape the island's tyranny. Moreau seizes him, straps him to a lab table, and injects him with another serum to force him to describe his animalistic transformation.

When Montgomery opposes Moreau and threatens him, Moreau shoots the man dead in the lab, revealing his ruthless streak. The act roils the hybrids and signals the coming collapse of Moreau's control.

M'Ling exposes Montgomery's corpse to the hybrids, triggering their anger and turning them against Moreau. The scientist is mortally wounded at the compound gate while trying to whip the rebellious creatures.

Braddock, Maria, M'Ling, and the benign servant women fight the rampage as the compound burns. Braddock resists killing Moreau, who dies from his injuries, and the group uses his corpse as a diversion to flee through the burning compound.

As chaos spreads, the wild animals Moreau kept are released and a battle erupts with the hybrids. Most man-beasts are killed by the wild animals or by the flames, and even the Sayer of the Law perishes in the chaos.

M'Ling risked his life to save Braddock, Maria, and the others from a lion. He and the lion fall into a pit trap in the ensuing chaos, leaving their fates uncertain and marking a selfless moment in the escape.

Braddock and Maria make a desperate escape in the lifeboat Braddock arrived in, pursued by a Hyena-Man. Braddock kills the Hyena-Man with a broken oar, ensuring they reach the safety of the open sea.

Sometime later, the serum wears off, returning Braddock to his full human state. Maria watches with changed, feline eyes as a passing ship looms on the horizon, offering hope of rescue.