TERROR IS A MAN

William Fitzgerald (Richard Derr), the lone survivor of a shipwreck, washes ashore on Blood Island. He is found by Dr. Charles Girard (Francis Lederer), a scientist who has set up a laboratory on the isolated island with his disenchanted wife, Frances (Greta Thyssen), and his assistant Walter Perrera (Oscar Keesee). The island's natives fear Dr. Girard, as he has been experimenting on a panther, surgically changing it with a series of painful operations into a half-man/half-panther beast, which occasionally escapes from its cage and kills an unwary villager. The creature is swathed in bandages, but his cat-like eyes and ears are still evident. The creature is attracted to Frances, as she is the only person on the island who shows him pity.

As time passes on the island, Fitzgerald and Frances eventually fall in love, and she asks him to take her away. The creature manages to free itself once again, but Walter sets the beast on fire and is able to recapture the scorched monster. Later, the beast escapes again and goes on a rampage, killing Walter and a young servant girl named Selene, and abducting Frances, carrying her off into the jungle. With William and Charles in hot pursuit, the creature is eventually cornered on the edge of a cliff, where it manages to hurl the mad doctor to his death. Before the creature can turn on the others, it is shot several times by William. Fleeing towards the beach, the wounded creature is helped by a young native boy, Tiago (Selene's little brother), and the unconscious beast drifts out to sea in a small rowboat.