88		The Man from Planet X (Horror, Romance, Sci-Fi, 1951)
87		Lifeforce (Action, Horror, Sci-Fi, 1985)
85		I Married a Monster from Outer Space (Horror, Sci-Fi, 1958)
81		Goke, Body Snatcher from Hell (Horror, Sci-Fi, 1968)
80		Invaders from Mars (Horror, Sci-Fi, 1986)
77		It Came from Outer Space (Horror, Sci-Fi, 1953)
76		The Thing from Another World (Horror, Sci-Fi, 1951)
75		Invisible Invaders (Sci-Fi, Horror, 1959)
73		Them! (Horror, Sci-Fi, 1954)
73		Five Million Years to Earth (Horror, Mystery, Sci-Fi, 1967)
72		Phantom from Space (Horror, Sci-Fi, 1953)
72		Species II (Action, Horror, Sci-Fi, 1998)
70		Village of the Damned (Horror, Sci-Fi, 1960)
70		Invasion of the Body Snatchers (Horror, Sci-Fi, 1956)
70		It! The Terror from Beyond Space (Horror, Sci-Fi, 1958)
70		Seedpeople (Horror, Sci-Fi, 1992)
70		Forbidden World (Horror, Sci-Fi, 1982)
68		The Quatermass Xperiment (Horror, Sci-Fi, 1955)
67		Queen of Blood (Horror, Sci-Fi, 1966)
67		Village of the Damned (Horror, Sci-Fi, Thriller, 1995)
67		Alien (Horror, Sci-Fi, 1979)
67		The Puppet Masters (Horror, Sci-Fi, Thriller, 1994)
65		Extraterrestrial (Horror, Sci-Fi, 2014)
65		Attack of the 50 Foot Woman (Horror, Sci-Fi, 1958)
65		The Faculty (Horror, Sci-Fi, 1998)
65		The Deadly Spawn (Horror, Sci-Fi, 1983)
65		Pitch Black (Horror, Sci-Fi, 2000)
62		They Live (Horror, Sci-Fi, Thriller, 1988)
62		Dark Breed (Action, Horror, Sci-Fi, 1996)
62		The Crazies (Action, Horror, Sci-Fi, 1973)
60		The Blob (Horror, Sci-Fi, 1958)
60		The Brain Eaters (Sci-Fi, Horror, 1958)
60		The Crawling Eye (Horror, Sci-Fi, 1958)
60		Creature (Horror, Sci-Fi, 1985)
60		Return of the Living Dead III (Horror, Sci-Fi, 1993)
60		Dead Silence (Horror, 2007)
60		Dr Jekyll & Sister Hyde (Horror, Sci-Fi, 1971)
59		Enemy from Space (Sci-Fi, Horror, 1957)
59		The Monster That Challenged the World (Horror, Sci-Fi, 1957)
59		Not of This Earth (Horror, Sci-Fi, 1957)
58		Target Earth (Horror, Sci-Fi, 1954)
58		The Earth Dies Screaming (Horror, Sci-Fi, 1964)
58		The Last Man on Earth (Horror, Sci-Fi, 1964)
57		Body Snatchers (Sci-Fi, Horror, Thriller, 1993)
57		Predator 2 (Action, Horror, Sci-Fi, 1990)
57		The Last Days on Mars (Horror, Sci-Fi, Thriller, 2013)
56		Panic in Year Zero! (Horror, Sci-Fi, Thriller, 1962)
55		This Island Earth (Horror, Mystery, Sci-Fi, 1955)
55		Heavy Metal (Animation, Adventure, Fantasy, Horror, 1981)
55		The Dark (Horror, Sci-Fi, 1979)
55		The Medusa Touch (Horror, Sci-Fi, 1978)
55		Alien Prey (Horror, Sci-Fi, 1977)
55		The Monster of Piedras Blancas (Horror, Sci-Fi, 1959)
55		Moontrap (Horror, Sci-Fi, 1989)
55		The Changeling (Fantasy, Horror, 1980)
55		The Gravedancers (Horror, 2006)
55		Dead & Buried (Horror, Mystery, 1981)
55		Without Warning (Sci-Fi, Horror, 1980)
54		The Hidden (Action, Crime, Horror, 1987)
54		The Thing (Horror, Mystery, Sci-Fi, 1982)
53		Bride of the Monster (Horror, Sci-Fi, 1955)
53		Witchcraft (Horror, Romance, 1964)
53		The Evil of Frankenstein (Horror, 1964)
52		The Invisible Ray (Horror, Sci-Fi, Thriller, 1936)
52		Strange Invaders (Horror, Mystery, Sci-Fi, 1983)
52		Species (Action, Horror, Sci-Fi, 1995)
52		Alien Abduction (Horror, Sci-Fi, Thriller, 2014)
52		Firestarter (Action, Horror, Sci-Fi, 1984)
52		Alien³ (Action, Horror, Sci-Fi, 1992)
52		Wait Until Dark (Horror, Thriller, 1967)
52		Resident Evil: Retribution (Action, Horror, Sci-Fi, 2012)
51		Godzilla, King of the Monsters! (Action, Horror, Sci-Fi, 1956)
51		It Conquered the World (Horror, Sci-Fi, Thriller, 1956)
50		Venom (Horror, 2005)
50		The Brain (Horror, Sci-Fi, 1988)
50		The Devil-Doll (Sci-Fi, Horror, 1936)
50		Dead of Night (Horror, 1974)
50		I Bury the Living (Horror, 1958)
50		City of the Living Dead (Horror, 1980)
50		The Prometheus Project (Horror, Sci-Fi, 2010)
50		Driller (Horror, Sci-Fi, 2006)
50		Dead Season (Horror, Sci-Fi, 2012)
50		Xtro (Horror, Sci-Fi, 1982)
49		The Fly (Drama, Fantasy, Horror, 1958)
49		Virus (Action, Horror, Thriller, 1999)
49		The Day of the Triffids (Horror, Sci-Fi, 1962)
49		The Exorcist III (Drama, Fantasy, Horror, 1990)
49		Green Room (Crime, Horror, Music, 2015)
48		Frankenstein (Drama, Horror, Sci-Fi, 1931)
48		Five (Drama, Horror, Sci-Fi, 1951)
48		Predator (Action, Horror, Sci-Fi, 1987)
47		Flight of the Living Dead (Action, Horror, Sci-Fi, 2007)
47		The Man They Could Not Hang (Crime, Horror, Sci-Fi, 1939)
47		Dreamcatcher (Drama, Horror, Sci-Fi, 2003)
47		God Told Me To (Crime, Horror, Sci-Fi, 1976)
47		Area 51 (Horror, Sci-Fi, Thriller, 2015)
47		The Lady and the Monster (Horror, Sci-Fi, Thriller, 1944)
47		Son of Frankenstein (Sci-Fi, Horror, Drama, 1939)
47		Alien: Resurrection (Action, Horror, Sci-Fi, 1997)
47		Blood Beast from Outer Space (Horror, Sci-Fi, 1965)
47		The Thing (Horror, Mystery, Sci-Fi, 2011)
47		Under the Skin (Drama, Horror, Sci-Fi, 2013)
46		20 Million Miles to Earth (Fantasy, Horror, Sci-Fi, 1957)
45		Fiend Without a Face (Horror, Sci-Fi, 1958)
45		Frankenstein 1970 (Horror, Sci-Fi, 1958)
45		How to Make a Monster (Horror, Sci-Fi, 1958)
45		Not Like Us (Horror, Sci-Fi, 1995)
45		The Colossus of New York (Horror, Sci-Fi, 1958)
45		Blood of the Vampire (Horror, Sci-Fi, 1958)
45		I Walked with a Zombie (Fantasy, Horror, 1943)
45		The Zombie Diaries (Horror, Sci-Fi, 2006)
45		The Spider (Horror, Sci-Fi, 1958)
45		Deep Space (Horror, Sci-Fi, 1988)
45		The Asphyx (Horror, Sci-Fi, 1972)
45		The Alligator People (Horror, Sci-Fi, 1959)
45		Garden of the Dead (Sci-Fi, Horror, 1972)
45		Blood of the Beast (Horror, Sci-Fi, 2003)
45		Mirrors (Horror, Mystery, 2008)
45		Survival of the Dead (Horror, 2009)
45		The Manster (Horror, Sci-Fi, 1959)
45		Zibahkhana (Horror, Thriller, 2007)
45		She Demons (Horror, Sci-Fi, 1958)
45		Pet Sematary (Fantasy, Horror, 1989)
45		Monster on the Campus (Horror, Sci-Fi, 1958)
45		War of the Satellites (Horror, Sci-Fi, 1958)
45		The Woman Eater (Horror, Sci-Fi, 1958)
45		Attack of the Puppet People (Sci-Fi, Horror, 1958)
45		The Wasp Woman (Horror, Sci-Fi, 1959)
44		World War Z (Action, Adventure, Horror, 2013)
44		The Brain That Wouldn't Die (Horror, Sci-Fi, 1962)
44		Hand of Death (Horror, Sci-Fi, 1962)
44		Varan the Unbelievable (Horror, Sci-Fi, 1962)
44		Zombies of Mora Tau (Action, Adventure, Fantasy, Horror, 1957)
44		Attack of the Crab Monsters (Horror, Sci-Fi, 1957)
44		The Man Who Turned to Stone (Horror, Sci-Fi, 1957)
44		She Devil (Horror, Sci-Fi, 1957)
44		The Curse of Frankenstein (Horror, Sci-Fi, 1957)
44		X the Unknown (Horror, Sci-Fi, 1956)
44		The Black Sleep (Horror, Sci-Fi, 1956)
44		The Craft (Drama, Fantasy, Horror, 1996)
44		Zombie Honeymoon (Drama, Horror, Romance, 2004)
44		Like Minds (Crime, Horror, Mystery, 2006)
44		The Man Without a Body (Horror, Sci-Fi, 1957)
44		The Werewolf (Sci-Fi, Horror, 1956)
44		The Cyclops (Horror, Sci-Fi, 1957)
44		The Black Scorpion (Horror, Sci-Fi, 1957)
44		The Unknown Terror (Horror, Sci-Fi, 1957)
44		I Was a Teenage Frankenstein (Horror, Sci-Fi, 1957)
43		Children of the Damned (Horror, Sci-Fi, 1964)
43		Creature from the Black Lagoon (Horror, Sci-Fi, 1954)
43		Tarantula (Horror, Sci-Fi, 1955)
43		It Came from Beneath the Sea (Horror, Sci-Fi, 1955)
43		Day the World Ended (Horror, Sci-Fi, 1955)
43		Unearthly Stranger (Horror, Sci-Fi, 1963)
43		Revenge of the Creature (Horror, Sci-Fi, 1955)
42		Donovan's Brain (Sci-Fi, Horror, 1953)
42		The Maze (Horror, Sci-Fi, 1953)
42		Another World (Action, Horror, Sci-Fi, 2014)
42		The Ghost of Frankenstein (Drama, Horror, Sci-Fi, 1942)
42		Spring (Horror, Romance, Sci-Fi, 2014)
42		Dark Skies (Horror, Sci-Fi, Thriller, 2013)
42		AVP: Alien vs. Predator (Action, Horror, Sci-Fi, 2004)
42		Aliens vs. Predator: Requiem (Action, Horror, Sci-Fi, 2007)
42		Frankenstein Meets the Wolf Man (Fantasy, Horror, Sci-Fi, 1943)
42		The Neanderthal Man (Horror, Sci-Fi, 1953)
42		Devils of Darkness (Horror, 1965)
42		Altered (Horror, Sci-Fi, Thriller, 2006)
42		Chamber of Horrors (Horror, 1966)
42		The Frozen Dead (Sci-Fi, Horror, 1966)
42		Shock Waves (Horror, Mystery, Sci-Fi, 1977)
42		Quarantine (Horror, Sci-Fi, Thriller, 2008)
42		Sting of Death (Horror, Sci-Fi, 1965)
42		The Plague of the Zombies (Fantasy, Horror, 1966)
42		Phantasm (Fantasy, Horror, Sci-Fi, 1979)
41		Night of the Living Dead (Drama, Horror, Mystery, 1968)
41		Nightbeasts (Horror, Sci-Fi, 2010)
41		The Wicker Man (Horror, Mystery, 1973)
41		It! (Horror, Sci-Fi, 1967)
41		Brides of Blood (Horror, Sci-Fi, 1968)
41		Island of Lost Souls (Horror, Sci-Fi, 1932)
41		Dr. Jekyll and Mr. Hyde (Horror, Sci-Fi, 1931)
40		Willard (Horror, Sci-Fi, 1971)
40		The Toy Box (Horror, Sci-Fi, 1971)
40		Midnight (Horror, 1982)
40		The Devil's Rejects (Crime, Horror, 2005)
40		Ticks (Horror, Sci-Fi, 1993)
40		The Curse (Sci-Fi, Horror, 1987)
40		The Man Who Lived Again (Horror, Sci-Fi, 1936)
40		The Man with Two Heads (Horror, Sci-Fi, 1972)
40		The Invisible Man's Revenge (Horror, Sci-Fi, 1944)
40		The Creeping Flesh (Horror, Sci-Fi, 1973)
40		Alligator (Horror, Sci-Fi, 1980)
40		Horror Express (Horror, Sci-Fi, 1972)
40		From Beyond (Horror, Sci-Fi, 1986)
40		Hungerford (Horror, Sci-Fi, 2014)
40		The Monster Maker (Horror, Sci-Fi, 1944)
40		Spasms (Horror, Sci-Fi, 1983)
40		Island Claws (Horror, Sci-Fi, 1980)
40		Growth (Horror, Sci-Fi, 2010)
40		The Serpent and the Rainbow (Fantasy, Horror, 1988)
40		The Diabolical (Horror, Sci-Fi, 2015)
40		Slugs (Horror, Sci-Fi, 1988)
40		Silent Night, Zombie Night (Horror, Sci-Fi, 2009)
40		Subterano (Horror, Sci-Fi, 2003)
40		The Boogey Man (Horror, Sci-Fi, 1980)
40		The Lawnmower Man (Horror, Sci-Fi, 1992)
40		Scared to Death (Horror, Sci-Fi, 1980)
40		Syngenor (Horror, Sci-Fi, 1990)
40		The Dead Next Door (Horror, 1989)
40		Pulse (Horror, Sci-Fi, 1988)
40		Invasion of the Bee Girls (Horror, Sci-Fi, 1973)
40		Metamorphosis: The Alien Factor (Horror, Sci-Fi, 1990)
40		The Alien Factor (Horror, Sci-Fi, 1978)
40		Debug (Horror, Sci-Fi, 2014)
40		Kingdom of the Spiders (Horror, Sci-Fi, 1977)
40		Demon Seed (Horror, Sci-Fi, 1977)
40		The Fog (Fantasy, Horror, 1980)
40		C.H.U.D. (Horror, Sci-Fi, 1984)
40		Zombie (Horror, 1979)
40		The Visitor (Horror, Sci-Fi, 1979)
40		Shadowzone (Horror, Sci-Fi, 1990)
40		The Brood (Horror, Sci-Fi, 1979)
40		Invasion of the Body Snatchers (Horror, Sci-Fi, 1978)
40		Prophecy (Sci-Fi, Horror, 1979)
40		Rabid (Horror, Sci-Fi, 1977)
40		Terror of Frankenstein (Horror, Sci-Fi, 1977)
40		The Mutations (Horror, Sci-Fi, 1974)
40		Harbinger Down (Horror, Sci-Fi, 2015)
40		Humanoids from the Deep (Horror, Sci-Fi, 1980)
40		Day of the Dead (Horror, 1985)
40		Sssssss (Horror, Sci-Fi, 1973)
40		The Children (Horror, Sci-Fi, 1980)
40		The Arrival (Horror, Sci-Fi, 1991)
40		The Fly II (Horror, Sci-Fi, 1989)
40		Death Warmed Over (Horror, Sci-Fi, 1984)
40		The Terror Within II (Horror, Sci-Fi, 1991)
40		Embryo (Horror, Sci-Fi, 1976)
40		The Mist (Horror, Sci-Fi, 2007)
40		Shivers (Horror, Sci-Fi, 1975)
40		The Crazies (Horror, Thriller, 2010)
40		Future Shock (Sci-Fi, Horror, 1994)
40		Lone Wolf (Horror, Sci-Fi, 1988)
40		Scream (Horror, Mystery, 1996)
40		Mimic (Horror, Sci-Fi, 1997)
40		Storage 24 (Horror, Sci-Fi, 2012)
40		Transformations (Horror, Sci-Fi, 1988)
40		Poltergeist (Horror, Thriller, 2015)
40		The Corpse Vanishes (Horror, Sci-Fi, 1942)
40		Swamp Thing (Horror, Sci-Fi, 1982)
40		The Jungle Captive (Horror, Sci-Fi, 1945)
40		Hellraiser: Bloodline (Horror, Sci-Fi, 1996)
40		Nightmares (Horror, Sci-Fi, 1983)
40		Ravager (Horror, Sci-Fi, 1997)
40		Aberration (Horror, Sci-Fi, 1997)
40		The Bone Snatcher (Horror, Sci-Fi, 2003)
40		13 Eerie (Horror, Sci-Fi, 2013)
40		The Frankenstein Theory (Horror, Sci-Fi, 2013)
40		The Terror Within (Horror, Sci-Fi, 1989)
40		Frankenstein's Army (Horror, Sci-Fi, 2013)
40		The Devil Commands (Horror, Sci-Fi, 1941)
40		Scary or Die (Horror, 2012)
40		Dr. Jekyll and Mr. Hyde (Horror, Sci-Fi, 1941)
40		Deadly Eyes (Horror, Sci-Fi, 1982)
40		The Devil Bat (Horror, Sci-Fi, 1940)
40		Night of the Scarecrow (Horror, Sci-Fi, 1995)
40		Rejuvenatrix (Horror, Sci-Fi, 1988)
40		The Dead (Horror, 2010)
40		White Zombie (Horror, 1932)
40		The Sunderland Experiment (Horror, Sci-Fi, 2014)
40		Scintilla (Horror, Sci-Fi, 2014)
40		Paranormal Activity 2 (Horror, 2010)
40		Cameron's Closet (Horror, Sci-Fi, 1988)
40		Captive Wild Woman (Horror, Sci-Fi, 1943)
40		Project: Metalbeast (Horror, Sci-Fi, 1995)
40		The Nest (Horror, Sci-Fi, 1988)

Notes: Movies similar to Plan 9 from Outer Space, Movies like Plan 9 from Outer Space, Horror, Sci-Fi, Edward D. Wood Jr., Gregory Walcott, Tom Keene, Mona McKinnon, Duke Moore, Films, Video, Movie Similarities