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From the liner notes

The Manster
An American reporter in Japan is sent to interview an eccentric Japanese scientist working on bizarre experiments in his mountain laboratory. When the doctor realizes that the hapless correspondent is the perfect subject for his next experiment, he drugs the unfortunate man and injects him with a serum that gradually transforms him into a hideous, two–headed monster.

The Brain That Wouldn't Die
Dr. Bill Cortner has been performing experimental surgery on human guinea pigs without authorization and against the advice of his father, also a surgeon. When Bill's fiancée Jan Compton is decapitated in an automobile accident, he manages to keep her brain alive. He now needs to find a new body for his bride–to–be and settles on Doris Powell, a glamor model with a facial disfigurement. Jan meanwhile doesn't want to continue her body–less existence and calls upon the creature hidden in the basement, one of Bill Cortner's unsuccessful experiments, to break loose.