Swamp Of The Lost Monsters (1964)

aka's: Swamp Of The Lost Souls/
El Pantano De Las Animas

Produced in Mexico and re-edited and dubbed for American TV, this film falls into the western-horror-mystery-comedy-musical genre. A disappearing body leads a detective and his sidekick into an encounter with a gill man. Stars Gastón Santos, Rayo de Plata and Manola Saavedra.