67		The Deadly Mantis (Horror, Sci-Fi, Thriller, 1957)
65		Reptilicus (Action, Horror, Sci-Fi, 1961)
62		Dark Breed (Action, Horror, Sci-Fi, 1996)
57		Fiend Without a Face (Horror, Sci-Fi, 1958)
56		This Island Earth (Horror, Mystery, Sci-Fi, 1955)
56		The Quatermass Xperiment (Horror, Sci-Fi, 1955)
54		The Thing (Horror, Mystery, Sci-Fi, 1982)
54		Children of the Damned (Horror, Sci-Fi, 1964)
53		Predator (Action, Horror, Sci-Fi, 1987)
52		It Conquered the World (Horror, Sci-Fi, Thriller, 1956)
52		The Puppet Masters (Horror, Sci-Fi, Thriller, 1994)
52		It! The Terror from Beyond Space (Horror, Sci-Fi, 1958)
50		Frankenstein Meets the Wolf Man (Fantasy, Horror, Sci-Fi, 1943)
50		Phantasm (Fantasy, Horror, Sci-Fi, 1979)
47		The Fly II (Horror, Sci-Fi, 1989)
47		Body Snatchers (Sci-Fi, Horror, Thriller, 1993)
47		Alien³ (Action, Horror, Sci-Fi, 1992)
47		Five Million Years to Earth (Horror, Mystery, Sci-Fi, 1967)
47		The Thing (Horror, Mystery, Sci-Fi, 2011)
47		Apollo 18 (Horror, Mystery, Sci-Fi, 2011)
47		Not of This Earth (Horror, Sci-Fi, 1957)
47		I Married a Monster from Outer Space (Horror, Sci-Fi, 1958)
47		Werewolf of London (Drama, Fantasy, Horror, 1935)
47		Species (Action, Horror, Sci-Fi, 1995)
47		Attack of the 50 Foot Woman (Horror, Sci-Fi, 1958)
45		It Came from Outer Space (Horror, Sci-Fi, 1953)
45		The Giant Claw (Fantasy, Horror, Sci-Fi, 1957)
44		Godzilla vs. Biollante (Action, Drama, Horror, 1989)
44		The Swarm (Horror, 1978)
44		The Earth Dies Screaming (Horror, Sci-Fi, 1964)
44		The Man from Planet X (Horror, Romance, Sci-Fi, 1951)
44		Alien (Horror, Sci-Fi, 1979)
44		The Thing from Another World (Horror, Sci-Fi, 1951)
43		28 Days Later... (Drama, Horror, Sci-Fi, 2002)
42		Creature (Horror, Sci-Fi, 1985)
42		The Children (Horror, Sci-Fi, 1980)
42		Invaders from Mars (Horror, Sci-Fi, 1986)
42		Lifeforce (Action, Horror, Sci-Fi, 1985)
42		Xtro (Horror, Sci-Fi, 1982)
42		The Last Days on Mars (Horror, Sci-Fi, Thriller, 2013)
42		Alien: Resurrection (Action, Horror, Sci-Fi, 1997)
42		The Fly (Drama, Fantasy, Horror, 1958)
42		The Invisible Ray (Horror, Sci-Fi, Thriller, 1936)
42		Species II (Action, Horror, Sci-Fi, 1998)
42		The Blob (Horror, Sci-Fi, 1958)
42		Ravenous (Fantasy, Horror, Thriller, 1999)
42		The Brain Eaters (Sci-Fi, Horror, 1958)
42		Moontrap (Horror, Sci-Fi, 1989)
42		Alien Abduction (Horror, Sci-Fi, Thriller, 2014)
42		Area 51 (Horror, Sci-Fi, Thriller, 2015)
42		Village of the Damned (Horror, Sci-Fi, Thriller, 1995)
42		Dreamcatcher (Drama, Horror, Sci-Fi, 2003)
42		Enemy from Space (Sci-Fi, Horror, 1957)
41		Plan 9 from Outer Space (Horror, Sci-Fi, 1959)
40		Eraserhead (Fantasy, Horror, Sci-Fi, 1977)
40		Phantom from Space (Horror, Sci-Fi, 1953)
40		Wonderland (Fantasy, Horror, Sci-Fi, 2011)
40		Beyond Atlantis (Fantasy, Horror, Sci-Fi, 1973)
40		Twilight Zone: The Movie (Fantasy, Horror, Sci-Fi, 1983)
40		House of Dracula (Fantasy, Horror, Sci-Fi, 1945)
40		Andromina: The Pleasure Planet (Fantasy, Horror, Sci-Fi, 1999)
40		House of Frankenstein (Fantasy, Horror, Sci-Fi, 1944)
40		Phantasm IV: Oblivion (Fantasy, Horror, Sci-Fi, 1998)
39		Virus (Action, Horror, Thriller, 1999)
39		The Brain from Planet Arous (Action, Adventure, Horror, 1957)
38		Queen of Blood (Horror, Sci-Fi, 1966)
37		The Crazies (Action, Horror, Sci-Fi, 1973)
37		The Stepford Wives (Horror, Mystery, Sci-Fi, 1975)
37		The Omen (Fantasy, Horror, Mystery, 2006)
37		They Live (Horror, Sci-Fi, Thriller, 1988)
37		Altered (Horror, Sci-Fi, Thriller, 2006)
37		The Body Stealers (Horror, Mystery, Sci-Fi, 1969)
37		Island of the Burning Damned (Horror, Mystery, Sci-Fi, 1967)
37		Pitch Black (Horror, Sci-Fi, 2000)
37		Event Horizon (Horror, Sci-Fi, Thriller, 1997)
37		Ghost in the Machine (Horror, Sci-Fi, Thriller, 1993)
37		Seedpeople (Horror, Sci-Fi, 1992)
37		The Blob (Horror, Sci-Fi, Thriller, 1988)
37		Goke, Body Snatcher from Hell (Horror, Sci-Fi, 1968)
37		The Dark Side of the Moon (Action, Horror, Sci-Fi, 1990)
37		Aliens vs. Predator: Requiem (Action, Horror, Sci-Fi, 2007)
37		Strange Invaders (Horror, Mystery, Sci-Fi, 1983)
37		The Crawling Eye (Horror, Sci-Fi, 1958)
37		Unearthed (Horror, Mystery, Sci-Fi, 2007)
37		Rare Exports (Adventure, Fantasy, Horror, 2010)
37		Pulse (Horror, Sci-Fi, 1988)
37		Without Warning (Sci-Fi, Horror, 1980)
36		Target Earth (Horror, Sci-Fi, 1954)
36		The Innocents (Fantasy, Horror, 1961)
36		Terror Is a Man (Horror, Romance, Sci-Fi, 1959)
36		Invisible Invaders (Sci-Fi, Horror, 1959)
35		Pit and the Pendulum (Drama, Fantasy, Horror, 1961)
34		Murders in the Zoo (Crime, Horror, 1933)
34		The Messengers (Horror, Mystery, Thriller, 2007)
34		Five (Drama, Horror, Sci-Fi, 1951)
34		The Darkest Hour (Action, Adventure, Horror, 2011)
34		The Last Man on Earth (Horror, Sci-Fi, 1964)
34		Dr. Renault's Secret (Horror, Mystery, Romance, 1942)
33		Curse of the Demon (Fantasy, Horror, Mystery, 1957)
33		The Incredible Shrinking Man (Drama, Horror, Sci-Fi, 1957)
33		Invasion of the Body Snatchers (Horror, Sci-Fi, 1956)
32		Not Like Us (Horror, Sci-Fi, 1995)
32		The Deadly Spawn (Horror, Sci-Fi, 1983)
32		Extraterrestrial (Horror, Sci-Fi, 2014)
32		Monster on the Campus (Horror, Sci-Fi, 1958)
32		Vicious Lips (Horror, Music, Sci-Fi, 1986)
32		Progeny (Horror, Sci-Fi, Thriller, 1998)
32		Alien Raiders (Action, Horror, Sci-Fi, 2008)
32		The Faculty (Horror, Sci-Fi, 1998)
32		Polymorph (Action, Horror, Sci-Fi, 1996)
32		Insidious (Fantasy, Horror, Mystery, 2010)
32		The Medusa Touch (Horror, Sci-Fi, 1978)
32		Alien Prey (Horror, Sci-Fi, 1977)
32		Strange Behavior (Horror, Mystery, Sci-Fi, 1981)
32		Who Can Kill a Child? (Fantasy, Horror, 1976)
32		Unaware (Horror, Sci-Fi, Thriller, 2010)
32		Driller (Horror, Sci-Fi, 2006)
32		The Brain (Horror, Sci-Fi, 1988)
32		Lady in White (Fantasy, Horror, Mystery, 1988)
32		The Dark (Horror, Sci-Fi, 1979)
32		Ultraviolet (Action, Horror, Sci-Fi, 2006)
32		Child's Play 2 (Fantasy, Horror, 1990)
32		Under the Skin (Drama, Horror, Sci-Fi, 2013)
32		Let Me In (Drama, Fantasy, Horror, 2010)
32		Twin Peaks: Fire Walk with Me (Drama, Fantasy, Horror, 1992)
32		Godsend (Drama, Horror, Sci-Fi, 2004)
32		Forbidden World (Horror, Sci-Fi, 1982)
32		Predator 2 (Action, Horror, Sci-Fi, 1990)
32		Dark Skies (Horror, Sci-Fi, Thriller, 2013)
32		AVP: Alien vs. Predator (Action, Horror, Sci-Fi, 2004)
32		Demonwarp (Horror, Mystery, Sci-Fi, 1988)
32		Shivers (Horror, Sci-Fi, 1975)
32		The Beast of Hollow Mountain (Horror, Romance, Sci-Fi, 1956)
32		Horror of Dracula (Fantasy, Horror, 1958)
32		The Werewolf (Sci-Fi, Horror, 1956)
32		War of the Satellites (Horror, Sci-Fi, 1958)
32		Clown (Drama, Fantasy, Horror, 2014)
32		She Demons (Horror, Sci-Fi, 1958)
32		I Was a Teenage Frankenstein (Horror, Sci-Fi, 1957)
32		The Colossus of New York (Horror, Sci-Fi, 1958)
32		The Woman Eater (Horror, Sci-Fi, 1958)
32		The Spider (Horror, Sci-Fi, 1958)
32		The Gamma People (Drama, Horror, Sci-Fi, 1956)
32		Attack of the Puppet People (Sci-Fi, Horror, 1958)
32		The Cosmic Monster (Drama, Sci-Fi, Horror, 1958)
32		Godzilla, King of the Monsters! (Action, Horror, Sci-Fi, 1956)
32		Daughter of Dr. Jekyll (Fantasy, Horror, 1957)
32		The Black Sleep (Horror, Sci-Fi, 1956)
32		The Monolith Monsters (Drama, Horror, Sci-Fi, 1957)
32		Space Master X-7 (Horror, Sci-Fi, Thriller, 1958)
32		X the Unknown (Horror, Sci-Fi, 1956)
32		Blood of the Vampire (Horror, Sci-Fi, 1958)
32		I Was a Teenage Werewolf (Drama, Fantasy, Horror, 1957)
32		The Unknown Terror (Horror, Sci-Fi, 1957)
32		The Monster That Challenged the World (Horror, Sci-Fi, 1957)
32		The Vampire (Horror, Sci-Fi, Thriller, 1957)
32		Curse of the Faceless Man (Adventure, Horror, Sci-Fi, 1958)
32		The Cyclops (Horror, Sci-Fi, 1957)
32		The Mole People (Adventure, Fantasy, Horror, 1956)
32		Frankenstein 1970 (Horror, Sci-Fi, 1958)
32		The Man Without a Body (Horror, Sci-Fi, 1957)
32		Attack of the Crab Monsters (Horror, Sci-Fi, 1957)
32		The Black Scorpion (Horror, Sci-Fi, 1957)
32		The Man Who Turned to Stone (Horror, Sci-Fi, 1957)
32		How to Make a Monster (Horror, Sci-Fi, 1958)
32		The Abominable Snowman (Adventure, Horror, Sci-Fi, 1957)
32		The Curse of Frankenstein (Horror, Sci-Fi, 1957)
32		She Devil (Horror, Sci-Fi, 1957)
31		Tarantula (Horror, Sci-Fi, 1955)
31		Day the World Ended (Horror, Sci-Fi, 1955)
31		Creature with the Atom Brain (Crime, Horror, Sci-Fi, 1955)
31		Creature from the Black Lagoon (Horror, Sci-Fi, 1954)
31		The Mummy (Adventure, Fantasy, Horror, 1959)
31		The Manster (Horror, Sci-Fi, 1959)
31		4D Man (Sci-Fi, Horror, Romance, 1959)
31		The Wasp Woman (Horror, Sci-Fi, 1959)
31		The Leech Woman (Horror, Romance, Sci-Fi, 1960)
31		Return of the Fly (Drama, Fantasy, Horror, 1959)
31		The Alligator People (Horror, Sci-Fi, 1959)
31		First Man Into Space (Drama, Horror, Sci-Fi, 1959)
31		The Giant Behemoth (Drama, Fantasy, Horror, 1959)
31		The Monster of Piedras Blancas (Horror, Sci-Fi, 1959)
31		The Man Who Could Cheat Death (Drama, Horror, Sci-Fi, 1959)
31		House of Usher (Drama, Fantasy, Horror, 1960)
31		Village of the Damned (Horror, Sci-Fi, 1960)
31		It Came from Beneath the Sea (Horror, Sci-Fi, 1955)
31		Revenge of the Creature (Horror, Sci-Fi, 1955)
31		Bride of the Monster (Horror, Sci-Fi, 1955)
31		Cult of the Cobra (Fantasy, Horror, 1955)
31		Black Sunday (Fantasy, Horror, Thriller, 1960)
31		The Hands of Orlac (Crime, Horror, Sci-Fi, 1960)
31		Them! (Horror, Sci-Fi, 1954)
30		The Maze (Horror, Sci-Fi, 1953)
30		House of Wax (Crime, Fantasy, Horror, 1953)
30		The Beast from 20,000 Fathoms (Adventure, Horror, Sci-Fi, 1953)
30		Donovan's Brain (Sci-Fi, Horror, 1953)
30		The Neanderthal Man (Horror, Sci-Fi, 1953)
30		Carnival of Souls (Fantasy, Horror, Mystery, 1962)
30		Hand of Death (Horror, Sci-Fi, 1962)
30		Panic in Year Zero! (Horror, Sci-Fi, Thriller, 1962)
30		The Day of the Triffids (Horror, Sci-Fi, 1962)
30		Varan the Unbelievable (Horror, Sci-Fi, 1962)
30		These Are the Damned (Drama, Fantasy, Horror, 1962)
30		The Brain That Wouldn't Die (Horror, Sci-Fi, 1962)
30		The Haunting (Fantasy, Horror, 1963)
30		Night Tide (Fantasy, Horror, Thriller, 1961)

Notes: Movies similar to 20 Million Miles to Earth, Movies like 20 Million Miles to Earth, Fantasy, Horror, Sci-Fi, Nathan Juran, William Hopper, Joan Taylor, Thomas Browne Henry, Frank Puglia, Films, Video, Movie Similarities