Barton kills Grant in a jealous rage and dumps his body in the Gill Man's enclosure to make it look like his doing. Apparently aware that Barton is trying to pin the murder on him, Gill Man breaks down the gate, follows Barton to his room, and kills him by tossing him off the veranda. As Marcia, Morgan, Borg, and Johnson watch, Gill Man tears down the electric fence and gets away, but not before being shot in the chest. The next day, as Marcia prepares to leave for the train station, Morgan, Borg, and Johnson discuss the failure of their experiment. 'The beast remains a beast,' Borg says, but Morgan points out that the creature didn't attack until he was attacked, a step forward in his social development. In the final scene, the Gill Man walks across a bluff that leads to the ocean.