Scientific experiments backfire and produce horrific mutations: halfman, halffish which terrorize a small fishing village by killing the men and raping the women.
(Also known as Monster (Humanoids from the Deep).)
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Early Horner score, Bottin's gnarly monster/makeup design, Morrow joining in the cast, & a jaw-dropping final scene with a scream - All in a fast-paced, entertaining little cult sci-fi/horror classic... Still gotta love Corman's New World years.