The Manster (1959) is a Horror, Science Fiction film that follows an American journalist stationed in Japan is given a mysterious injection by a mad scientist, turning him into a murderous, two-headed monster. Currently, you can watch The Manster on Amazon Prime Video, fuboTV, MGM+ Amazon Channel, MGM Plus Roku Premium Channel. Streaming availability may vary by country and platform over time. It has a user rating of 4.6 out of 10 from 33 votes. Fans of horror movies may also want to explore similar titles below.