75		The Mad Ghoul (Horror, Sci-Fi, Thriller, 1943)
72		The Devil Bat (Horror, Sci-Fi, 1940)
67		The Last Man on Earth (Horror, Sci-Fi, 1964)
66		The Walking Dead (Crime, Horror, Sci-Fi, 1936)
66		Man Made Monster (Drama, Horror, Sci-Fi, 1941)
65		Frequency (Crime, Drama, Mystery, Sci-Fi, 2000)
62		Unforgettable (Drama, Mystery, Sci-Fi, 1996)
62		Tarantula (Horror, Sci-Fi, 1955)
62		Son of Frankenstein (Sci-Fi, Horror, Drama, 1939)
60		The Invisible Man Returns (Drama, Horror, Mystery, Sci-Fi, 1940)
57		Not of This Earth (Horror, Sci-Fi, 1957)
57		X the Unknown (Horror, Sci-Fi, 1956)
57		The Crazies (Action, Horror, Sci-Fi, 1973)
57		The Vampire Bat (Drama, Horror, Mystery, Sci-Fi, 1933)
57		Lifeforce (Action, Horror, Sci-Fi, 1985)
57		Shivers (Horror, Sci-Fi, 1975)
52		The Gamma People (Drama, Horror, Sci-Fi, 1956)
52		Soylent Green (Mystery, Sci-Fi, Thriller, 1973)
52		The Colossus of New York (Horror, Sci-Fi, 1958)
52		The Werewolf (Sci-Fi, Horror, 1956)
52		Black Friday (Drama, Horror, Sci-Fi, 1940)
52		God Told Me To (Crime, Horror, Sci-Fi, 1976)
52		Quarantine (Horror, Sci-Fi, Thriller, 2008)
52		The Vampire (Horror, Sci-Fi, Thriller, 1957)
52		The Purge: Election Year (Action, Horror, Sci-Fi, 2016)
52		X: The Man with the X-Ray Eyes (Horror, Sci-Fi, Thriller, 1963)
50		Rip Cage (Horror, Mystery, Sci-Fi, 2007)
50		Videodrome (Horror, Mystery, Sci-Fi, 1983)
50		Halloween III: Season of the Witch (Horror, Mystery, Sci-Fi, 1982)
50		Dr. Cyclops (Adventure, Drama, Horror, Sci-Fi, 1940)
50		The Bay (Horror, Mystery, Sci-Fi, 2012)
50		Point of No Return (Horror, Mystery, Sci-Fi, 1976)
50		An Incident at Bridgeville (Horror, Mystery, Sci-Fi, 2005)
50		Disturbing Behavior (Horror, Mystery, Sci-Fi, 1998)
49		Twelve Monkeys (Mystery, Sci-Fi, Thriller, 1995)
48		Ex Machina (Drama, Mystery, Sci-Fi, 2015)
48		Minority Report (Action, Mystery, Sci-Fi, 2002)
47		The Fly (Drama, Horror, Sci-Fi, 1986)
47		Another World (Action, Horror, Sci-Fi, 2014)
47		Silent Rage (Action, Horror, Sci-Fi, 1982)
47		Predestination (Drama, Mystery, Sci-Fi, 2014)
47		Firestarter (Action, Horror, Sci-Fi, 1984)
47		Nightmare City (Action, Horror, Sci-Fi, 1980)
47		The Curse of Frankenstein (Horror, Sci-Fi, 1957)
47		Donovan's Brain (Sci-Fi, Horror, 1953)
47		The 6th Day (Action, Mystery, Sci-Fi, 2000)
47		The I Inside (Mystery, Sci-Fi, Thriller, 2004)
47		I Am Legend (Drama, Horror, Sci-Fi, 2007)
47		Dr. Jekyll and Mr. Hyde (Drama, Horror, Sci-Fi, 1920)
47		I, Robot (Action, Mystery, Sci-Fi, 2004)
45		Devil's Pass (Horror, Mystery, Sci-Fi, 2013)
45		Island of the Burning Damned (Horror, Mystery, Sci-Fi, 1967)
45		Mad Love (Horror, Romance, Sci-Fi, 1935)
45		The Secret of Treasure Island (Action, Adventure, Crime, Sci-Fi, 1938)
45		Strange Behavior (Horror, Mystery, Sci-Fi, 1981)
45		Mysterious Doctor Satan (Adventure, Action, Crime, Sci-Fi, 1940)
45		This Island Earth (Horror, Mystery, Sci-Fi, 1955)
45		Scourge (Horror, Mystery, Sci-Fi, 2008)
45		The Invisible Man's Revenge (Horror, Sci-Fi, 1944)
45		Chemical Wedding (Horror, Mystery, Sci-Fi, 2008)
45		Castle of Evil (Horror, Mystery, Sci-Fi, 1966)
44		Escape from New York (Action, Sci-Fi, 1981)
44		Replicant (Action, Sci-Fi, Thriller, 2001)
44		The Omega Man (Action, Sci-Fi, 1971)
43		SOS Coast Guard (Adventure, Romance, Sci-Fi, 1937)
42		Terror Is a Man (Horror, Romance, Sci-Fi, 1959)
42		The Leech Woman (Horror, Sci-Fi, 1960)
42		The Medusa Touch (Horror, Sci-Fi, 1978)
42		Rabid (Horror, Sci-Fi, 1977)
42		Blindness (Drama, Mystery, Sci-Fi, 2008)
42		Almost Human (Horror, Sci-Fi, Thriller, 2013)
42		The Blob (Horror, Sci-Fi, 1958)
42		Frankenstein Must Be Destroyed (Horror, Drama, Sci-Fi, 1969)
42		Patrick (Horror, Romance, Sci-Fi, 1978)
42		The Frozen Dead (Sci-Fi, Horror, 1966)
42		Willard (Drama, Horror, Sci-Fi, 2003)
42		The Resurrection of Zachary Wheeler (Sci-Fi, Mystery, Thriller, 1971)
42		The Remnant (Horror, Sci-Fi, Thriller, 2001)
42		Spring (Horror, Romance, Sci-Fi, 2014)
42		The Abominable Snowman (Adventure, Horror, Sci-Fi, 1957)
42		Lifespan (Drama, Mystery, Sci-Fi, 1975)
42		Paycheck (Action, Mystery, Sci-Fi, 2003)
42		The Thing (Horror, Mystery, Sci-Fi, 1982)
42		Deadly Friend (Drama, Horror, Sci-Fi, 1986)
42		The Prometheus Project (Horror, Sci-Fi, 2010)
42		The Beast from 20,000 Fathoms (Adventure, Horror, Sci-Fi, 1953)
42		Monkey Shines (Drama, Horror, Sci-Fi, 1988)
42		Alien: Resurrection (Action, Horror, Sci-Fi, 1997)
42		Thirst (Horror, Romance, Sci-Fi, 1979)
42		The Terror Within (Horror, Sci-Fi, 1989)
42		Night Shadows (Horror, Sci-Fi, Thriller, 1984)
42		The Jade Mask (Horror, Mystery, Sci-Fi, 1945)
42		The Blob (Horror, Sci-Fi, Thriller, 1988)
41		The Devil-Doll (Sci-Fi, Horror, 1936)
41		Dark City (Action, Drama, Fantasy, Sci-Fi, 1998)
40		Five Million Years to Earth (Horror, Mystery, Sci-Fi, 1967)
40		Impulse (Horror, Mystery, Sci-Fi, 1984)
40		Altitude (Horror, Mystery, Sci-Fi, 2010)
40		The Body Stealers (Horror, Mystery, Sci-Fi, 1969)
40		Die, Monster, Die! (Mystery, Horror, Sci-Fi, 1965)
40		Demonwarp (Horror, Mystery, Sci-Fi, 1988)
40		Brain Dead (Horror, Mystery, Sci-Fi, 1990)
40		The Legend of Cooley Moon (Horror, Mystery, Sci-Fi, 2012)
40		Doctor Mordrid (Action, Fantasy, Horror, Sci-Fi, 1992)
40		The Vulture (Horror, Mystery, Sci-Fi, 1966)
40		The Supernaturals (Horror, Mystery, Sci-Fi, 1986)
40		Sky Captain and the World of Tomorrow (Action, Adventure, Mystery, Sci-Fi, 2004)
40		Headspace (Horror, Mystery, Sci-Fi, 2005)
40		Dreamland (Sci-Fi, Horror, Mystery, 2007)
40		The Relic (Horror, Mystery, Sci-Fi, 1997)
40		Evidence (Horror, Mystery, Sci-Fi, 2012)
40		Shock Waves (Horror, Mystery, Sci-Fi, 1977)
40		The Thing (Horror, Mystery, Sci-Fi, 2011)
40		Gui si (Drama, Horror, Mystery, Sci-Fi, 2006)
40		Apollo 18 (Horror, Mystery, Sci-Fi, 2011)
40		Bug (Sci-Fi, Horror, Mystery, 1975)
40		The Stepford Wives (Horror, Mystery, Sci-Fi, 1975)
40		The Faculty (Horror, Mystery, Sci-Fi, 1998)
40		Strange Invaders (Horror, Mystery, Sci-Fi, 1983)
40		Crawlspace (Horror, Mystery, Sci-Fi, 2012)
40		Cube Zero (Horror, Mystery, Sci-Fi, 2004)
40		Quarantine 2: Terminal (Horror, Mystery, Sci-Fi, 2011)
40		Chernobyl Diaries (Horror, Mystery, Sci-Fi, 2012)
40		Unearthed (Horror, Mystery, Sci-Fi, 2007)
40		The Shaft (Action, Horror, Mystery, Sci-Fi, 2001)
40		Decoder (Horror, Mystery, Sci-Fi, 1984)
40		The Bermuda Triangle (Horror, Sci-Fi, Mystery, 1978)
40		Shadowglade (Horror, Mystery, Sci-Fi, 2015)
40		Island of Lost Souls (Horror, Sci-Fi, 1932)
40		Frankenstein Meets the Wolf Man (Fantasy, Horror, Sci-Fi, 1943)
40		Flight 7500 (Horror, Mystery, Sci-Fi, 2014)
39		The Day the Earth Caught Fire (Drama, Sci-Fi, Romance, 1961)
39		Doomsday (Action, Sci-Fi, Thriller, 2008)
39		Soldier (Action, Drama, Sci-Fi, 1998)
39		Silent Running (Drama, Sci-Fi, 1972)
39		Cloud Atlas (Drama, Sci-Fi, 2012)
39		Universal Soldier (Action, Sci-Fi, Thriller, 1992)
39		The Final Countdown (Action, Sci-Fi, 1980)
38		Air Hawks (Action, Drama, Mystery, Sci-Fi, 1935)
37		Queen of Blood (Horror, Sci-Fi, 1966)
37		Chrysalis (Drama, Horror, Sci-Fi, 2014)
37		Disconnect (Drama, Mystery, Sci-Fi, 2010)
37		It! The Terror from Beyond Space (Horror, Sci-Fi, 1958)
37		Repo! The Genetic Opera (Horror, Musical, Sci-Fi, 2008)
37		Mad Doctor of Blood Island (Adventure, Horror, Sci-Fi, 1968)
37		I Was a Teenage Frankenstein (Horror, Sci-Fi, 1957)
37		The Collective (Horror, Sci-Fi, Thriller, 2011)
37		The Creeping Flesh (Horror, Sci-Fi, 1973)
37		Swamp Thing (Horror, Sci-Fi, 1982)
37		She Demons (Horror, Sci-Fi, 1958)
37		The Dead Zone (Horror, Sci-Fi, Thriller, 1983)
37		Willard (Horror, Sci-Fi, 1971)
37		Scanners (Action, Horror, Sci-Fi, 1981)
37		The Man Without a Body (Horror, Sci-Fi, 1957)
37		Wonderland (Fantasy, Horror, Sci-Fi, 2011)
37		The Dark (Horror, Sci-Fi, 1979)
37		Predator 2 (Action, Horror, Sci-Fi, 1990)
37		Death Street USA (Action, Sci-Fi, Horror, 1988)
37		Godsend (Drama, Horror, Sci-Fi, 2004)
37		Lone Wolf (Horror, Sci-Fi, 1988)
37		Demon Seed (Horror, Sci-Fi, 1977)
37		The Arrival (Horror, Sci-Fi, 1991)
37		Metamorphosis: The Alien Factor (Horror, Sci-Fi, 1990)
37		Blade II (Action, Horror, Sci-Fi, 2002)
37		Godzilla, King of the Monsters! (Action, Horror, Sci-Fi, 1956)
35		Nobody (Crime, Horror, Mystery, Sci-Fi, 2007)
35		The Lady and the Monster (Horror, Sci-Fi, Thriller, 1944)
35		The Hidden (Action, Crime, Horror, Sci-Fi, 1987)
35		Izo (Action, Drama, Fantasy, Sci-Fi, 2004)
35		Wicked City (Animation, Fantasy, Horror, Sci-Fi, 1987)
35		Return of the Ape Man (Horror, Romance, Sci-Fi, 1944)
35		These Are the Damned (Drama, Fantasy, Horror, Sci-Fi, 1962)
35		Resident Evil: Degeneration (Animation, Action, Horror, Sci-Fi, 2008)
34		6 Hours to Live (Drama, Mystery, Sci-Fi, 1932)
34		Mad Max (Action, Adventure, Sci-Fi, 1979)
34		Jumper (Action, Adventure, Sci-Fi, 2008)
34		Dr. Renault's Secret (Horror, Mystery, Romance, Sci-Fi, 1942)
34		Universal Soldier: The Return (Action, Sci-Fi, 1999)
34		Timebomb (Action, Drama, Sci-Fi, 1991)
34		In Time (Action, Sci-Fi, Thriller, 2011)
34		Socket (Drama, Romance, Sci-Fi, 2007)
34		The Phantom Creeps (Sci-Fi, 1939)
33		Invasion of the Body Snatchers (Horror, Sci-Fi, 1956)
32		The Hiking Trip (Horror, Sci-Fi, Thriller, 2007)
32		Evolver (Action, Horror, Sci-Fi, 1995)
32		The Man They Could Not Hang (Crime, Horror, Sci-Fi, 1939)
32		Star Trek: The Motion Picture (Adventure, Mystery, Sci-Fi, 1979)
32		Project: Metalbeast (Horror, Sci-Fi, 1995)
32		Before I Hang (Crime, Horror, Sci-Fi, 1940)
32		Scared to Death (Horror, Sci-Fi, 1980)
32		Godzilla vs. Destoroyah (Action, Horror, Sci-Fi, 1995)
32		The Man with Nine Lives (Mystery, Sci-Fi, 1940)
32		Beyond Atlantis (Fantasy, Horror, Sci-Fi, 1973)
32		Driller (Horror, Sci-Fi, 2006)
32		Island Claws (Horror, Sci-Fi, 1980)
32		Prophecy (Sci-Fi, Horror, 1979)
32		Return of the Living Dead III (Horror, Romance, Sci-Fi, 1993)
32		Godzilla 1985 (Action, Horror, Sci-Fi, 1984)
32		Possible Worlds (Mystery, Sci-Fi, Crime, 2000)
32		The Monster of Piedras Blancas (Horror, Sci-Fi, 1959)
32		Iodine (Drama, Mystery, Sci-Fi, 2009)
32		Daybreakers (Action, Horror, Sci-Fi, 2009)
32		Curse of the Faceless Man (Adventure, Horror, Sci-Fi, 1958)
32		Alien Factor 2: The Alien Rampage (Horror, Sci-Fi, 2001)
32		The Returned (Drama, Horror, Sci-Fi, 2013)
32		Brainjacked (Horror, Sci-Fi, 2009)
32		From the Dark (Drama, Horror, Sci-Fi, 2009)
32		Rat Scratch Fever (Horror, Sci-Fi, 2011)
32		The Man with Two Heads (Horror, Sci-Fi, 1972)
32		The Twilight People (Adventure, Horror, Sci-Fi, 1972)
32		Messengers (Drama, Mystery, Sci-Fi, 2004)
32		The Monolith Monsters (Drama, Horror, Sci-Fi, 1957)
32		The Brain Leeches (Horror, Sci-Fi, 1978)
32		The Electronic Monster (Crime, Mystery, Sci-Fi, 1958)

Notes: Movies similar to The Return of Doctor X, Movies like The Return of Doctor X, Horror, Mystery, Sci-Fi, Vincent Sherman, Humphrey Bogart, Rosemary Lane, Wayne Morris, Dennis Morgan, SF, Science Fiction, SciFi, Sci Fi, Films, Video, Movie Similarities