99		Gorgo (Action, Drama, Horror, Sci-Fi, 1961)
65		Deep Rising (Action, Adventure, Horror, Sci-Fi, 1998)
60		Virus (Action, Horror, Thriller, Sci-Fi, 1999)
57		Creature from the Black Lagoon (Horror, Sci-Fi, 1954)
54		Sphere (Drama, Mystery, Sci-Fi, 1998)
52		Night Shadows (Horror, Sci-Fi, Thriller, 1984)
52		The Bermuda Triangle (Horror, Sci-Fi, Mystery, 1978)
49		Alien Nation (Action, Crime, Sci-Fi, 1988)
45		Frankenstein Unlimited (Horror, Sci-Fi, Thriller, 2009)
45		Leviathan (Adventure, Horror, Mystery, Sci-Fi, 1989)
45		Day of the Animals (Horror, Sci-Fi, Thriller, 1977)
45		Dark Skies (Horror, Sci-Fi, Thriller, 2013)
44		Port Sinister (Adventure, Crime, Sci-Fi, 1953)
44		Altered States (Horror, Sci-Fi, Thriller, 1980)
44		Warlords of the Deep (Fantasy, Adventure, Sci-Fi, 1978)
44		Phase IV (Horror, Sci-Fi, Thriller, 1974)
43		Night of the Lepus (Horror, Sci-Fi, Thriller, 1972)
42		Five Million Years to Earth (Horror, Mystery, Sci-Fi, 1967)
42		It Came from Beneath the Sea (Horror, Sci-Fi, 1955)
42		Memoirs of a Survivor (Sci-Fi, 1981)
42		Godzilla vs. Destoroyah (Action, Horror, Sci-Fi, 1995)
42		The Dead Zone (Horror, Sci-Fi, Thriller, 1983)
41		The Raiders of Atlantis (Action, Sci-Fi, 1983)
41		The Children (Horror, Sci-Fi, 1980)
41		The Brood (Horror, Sci-Fi, 1979)
41		The Visitor (Horror, Sci-Fi, 1979)
40		Endangered Species (Horror, Sci-Fi, Thriller, 2003)
40		Progeny (Horror, Sci-Fi, Thriller, 1998)
40		eXistenZ (Horror, Sci-Fi, Thriller, 1999)
40		Anatomie 2 (Horror, Sci-Fi, Thriller, 2003)
40		Supernova (Horror, Sci-Fi, Thriller, 2000)
40		Komodo (Horror, Sci-Fi, Thriller, 1999)
40		The Remnant (Horror, Sci-Fi, Thriller, 2001)
40		The Rage: Carrie 2 (Horror, Sci-Fi, Thriller, 1999)
40		The Cell (Horror, Sci-Fi, Thriller, 2000)
40		Primal Rage (Horror, Sci-Fi, Thriller, 1988)
40		The Kindred (Horror, Sci-Fi, Thriller, 1987)
40		Project Nightmare (Horror, Sci-Fi, Thriller, 1987)
40		The Blob (Horror, Sci-Fi, Thriller, 1988)
40		The Creeping Flesh (Horror, Sci-Fi, 1973)
40		X: The Man with the X-Ray Eyes (Horror, Sci-Fi, Thriller, 1963)
40		Panic in Year Zero! (Horror, Sci-Fi, Thriller, 1962)
40		These Are the Damned (Drama, Fantasy, Horror, Sci-Fi, 1962)
40		They Live (Horror, Sci-Fi, Thriller, 1988)
40		Guardian of the Realm (Sci-Fi, Horror, Thriller, 2004)
40		Village of the Damned (Horror, Sci-Fi, Thriller, 1995)
40		The Island of Dr. Moreau (Horror, Sci-Fi, Thriller, 1996)
40		Ghost in the Machine (Horror, Sci-Fi, Thriller, 1993)
40		Body Snatchers (Sci-Fi, Horror, Thriller, 1993)
40		Spontaneous Combustion (Horror, Sci-Fi, Thriller, 1990)
40		Mindwarp (Horror, Sci-Fi, Thriller, 1992)
40		Event Horizon (Horror, Sci-Fi, Thriller, 1997)
40		The Hunt (Horror, Sci-Fi, Thriller, 2006)
40		Almost Human (Horror, Sci-Fi, Thriller, 2013)
40		Dark Mountain (Horror, Sci-Fi, Thriller, 2013)
40		Cabin Fever: Patient Zero (Horror, Sci-Fi, Thriller, 2014)
40		Alien Abduction (Horror, Sci-Fi, Thriller, 2014)
40		Patrick (Horror, Sci-Fi, Thriller, 2013)
40		The Last Days on Mars (Horror, Sci-Fi, Thriller, 2013)
40		Antiviral (Horror, Sci-Fi, Thriller, 2012)
40		The Ghostmaker (Horror, Sci-Fi, Thriller, 2012)
40		Specter (Horror, Sci-Fi, Thriller, 2012)
40		The Purge (Horror, Sci-Fi, Thriller, 2013)
40		Beyond the Dark (Horror, Sci-Fi, Thriller, 2014)
40		Truth (Horror, Sci-Fi, Thriller, 2014)
40		Containment (Horror, Sci-Fi, Thriller, 2015)
40		Night People (Horror, Sci-Fi, Thriller, 2015)
40		Occupants (Horror, Sci-Fi, Thriller, 2015)
40		Cell (Horror, Sci-Fi, Thriller, 2016)
40		Man Vs. (Horror, Sci-Fi, Thriller, 2015)
40		The Hollow One (Horror, Sci-Fi, Thriller, 2015)
40		The Lazarus Effect (Horror, Sci-Fi, Thriller, 2015)
40		Plan 9 (Horror, Sci-Fi, Thriller, 2015)
40		Infini (Horror, Sci-Fi, Thriller, 2015)
40		Area 51 (Horror, Sci-Fi, Thriller, 2015)
40		State of Emergency (Horror, Sci-Fi, Thriller, 2011)
40		Savage (Horror, Sci-Fi, Thriller, 2011)
40		Asylum (Horror, Sci-Fi, Thriller, 2008)
40		The Objective (Horror, Sci-Fi, Thriller, 2008)
40		Quarantine (Horror, Sci-Fi, Thriller, 2008)
40		Splinter (Horror, Sci-Fi, Thriller, 2008)
40		The Hiking Trip (Horror, Sci-Fi, Thriller, 2007)
40		Kaw (Horror, Sci-Fi, Thriller, 2007)
40		Mulberry St (Horror, Sci-Fi, Thriller, 2006)
40		Altered (Horror, Sci-Fi, Thriller, 2006)
40		The Signal (Horror, Sci-Fi, Thriller, 2007)
40		Night Skies (Horror, Sci-Fi, Thriller, 2007)
40		Presence (Horror, Sci-Fi, Thriller, 2008)
40		The Thaw (Horror, Sci-Fi, Thriller, 2009)
40		Unaware (Horror, Sci-Fi, Thriller, 2010)
40		The Collective (Horror, Sci-Fi, Thriller, 2011)
40		The Millennium Bug (Horror, Sci-Fi, Thriller, 2011)
40		Spaceship Terror (Horror, Sci-Fi, Thriller, 2011)
40		Super Hybrid (Horror, Sci-Fi, Thriller, 2010)
40		Pickman's Muse (Horror, Sci-Fi, Thriller, 2010)
40		Dead Air (Horror, Sci-Fi, Thriller, 2009)
40		Beacon77 (Horror, Sci-Fi, Thriller, 2009)
40		2084 (Horror, Sci-Fi, Thriller, 2009)
40		Isolation (Horror, Sci-Fi, Thriller, 2005)
40		The Puppet Masters (Horror, Sci-Fi, Thriller, 1994)
40		The Deadly Mantis (Horror, Sci-Fi, Thriller, 1957)
40		The Lady and the Monster (Horror, Sci-Fi, Thriller, 1944)
40		The Mad Ghoul (Horror, Sci-Fi, Thriller, 1943)
40		The Vampire (Horror, Sci-Fi, Thriller, 1957)
40		It Conquered the World (Horror, Sci-Fi, Thriller, 1956)
40		The Secret of Treasure Island (Action, Adventure, Crime, Sci-Fi, 1938)
40		The Invisible Ray (Horror, Sci-Fi, Thriller, 1936)
40		Space Master X-7 (Horror, Sci-Fi, Thriller, 1958)
38		The Supernaturals (Horror, Mystery, Sci-Fi, 1986)
38		The Manhattan Project (Sci-Fi, Thriller, 1986)
38		The Final Countdown (Action, Sci-Fi, 1980)
37		Children of the Damned (Horror, Sci-Fi, 1964)
37		Demon Seed (Horror, Sci-Fi, 1977)
37		Death Street USA (Action, Sci-Fi, Horror, 1988)
37		DeepStar Six (Action, Horror, Sci-Fi, 1989)
35		The Abyss (Adventure, Drama, Sci-Fi, 1989)
34		Pacific Rim (Action, Adventure, Sci-Fi, 2013)
34		The Spy Who Loved Me (Action, Adventure, Sci-Fi, 1977)
33		Murder by Phone (Horror, Thriller, Mystery, Sci-Fi, 1982)
33		Alien (Horror, Sci-Fi, 1979)
32		The Alien Factor (Horror, Sci-Fi, 1978)
32		Destination Inner Space (Sci-Fi, Thriller, 1966)
32		Patrick (Horror, Romance, Sci-Fi, 1978)
32		The Medusa Touch (Horror, Sci-Fi, 1978)
32		Capricorn One (Action, Sci-Fi, Thriller, 1977)
32		Blade Runner (Sci-Fi, Thriller, 1982)
32		Futureworld (Sci-Fi, Thriller, 1976)
32		Point of No Return (Horror, Mystery, Sci-Fi, 1976)
32		God Told Me To (Crime, Horror, Sci-Fi, 1976)
32		The Food of the Gods (Adventure, Horror, Sci-Fi, 1976)
32		Embryo (Horror, Sci-Fi, 1976)
32		Centrespread (Drama, Sci-Fi, 1981)
32		TRON (Action, Adventure, Sci-Fi, 1982)
32		Twilight's Last Gleaming (Sci-Fi, Thriller, 1977)
32		Eraserhead (Fantasy, Horror, Sci-Fi, 1977)
32		Shock Waves (Horror, Mystery, Sci-Fi, 1977)
32		Kingdom of the Spiders (Horror, Sci-Fi, 1977)
32		The Brain Leeches (Horror, Sci-Fi, 1978)
32		The Thing (Horror, Mystery, Sci-Fi, 1982)
32		Terror of Frankenstein (Horror, Sci-Fi, 1977)
32		Rabid (Horror, Sci-Fi, 1977)
32		Alien Prey (Horror, Sci-Fi, 1977)
32		Invasion of the Body Snatchers (Horror, Sci-Fi, 1978)
32		The Bay (Horror, Mystery, Sci-Fi, 2012)
32		House of Frankenstein (Fantasy, Horror, Sci-Fi, 1944)
32		Village of the Damned (Horror, Sci-Fi, 1960)
32		Resident Evil (Action, Horror, Sci-Fi, 2002)
31		Image of the Beast (Sci-Fi, Thriller, 1980)
31		Nightmare City (Action, Horror, Sci-Fi, 1980)
31		Shivers (Horror, Sci-Fi, 1975)
31		Island Claws (Horror, Sci-Fi, 1980)
31		The Killings at Outpost Zeta (Sci-Fi, Thriller, 1980)
31		The Mutations (Horror, Sci-Fi, 1974)
31		The Terminal Man (Sci-Fi, Thriller, 1974)
31		UFO... annientare S.H.A.D.O. stop. Uccidete Straker... (Action, Sci-Fi, Thriller, 1974)
31		The Stepford Wives (Horror, Mystery, Sci-Fi, 1975)
31		Who? (Mystery, Sci-Fi, Thriller, 1975)
31		Bug (Sci-Fi, Horror, Mystery, 1975)
31		Scared to Death (Horror, Sci-Fi, 1980)
31		Without Warning (Sci-Fi, Horror, 1980)
31		Prophecy (Sci-Fi, Horror, 1979)
31		Saturn 3 (Adventure, Sci-Fi, Thriller, 1980)
31		The Dark (Horror, Sci-Fi, 1979)
31		Phantasm (Fantasy, Horror, Sci-Fi, 1979)
31		Plague (Sci-Fi, Drama, Thriller, 1979)
31		Agency (Drama, Sci-Fi, Thriller, 1980)
31		Thirst (Horror, Romance, Sci-Fi, 1979)
31		Humanoids from the Deep (Horror, Sci-Fi, 1980)
31		Alligator (Horror, Sci-Fi, 1980)
30		The Last Days of Man on Earth (Sci-Fi, Thriller, 1973)
30		Westworld (Action, Sci-Fi, Thriller, 1973)
30		Wonder Women (Action, Horror, Sci-Fi, 1973)
30		Beyond Atlantis (Fantasy, Horror, Sci-Fi, 1973)
30		Invasion of the Bee Girls (Horror, Sci-Fi, 1973)
30		The Day of the Dolphin (Drama, Sci-Fi, Thriller, 1973)
30		Strange Behavior (Horror, Mystery, Sci-Fi, 1981)
30		Deadly Eyes (Horror, Sci-Fi, 1982)
30		Sssssss (Horror, Sci-Fi, 1973)
30		Looker (Drama, Sci-Fi, Thriller, 1981)
30		Turkey Shoot (Drama, Horror, Sci-Fi, 1982)
30		Forbidden World (Horror, Sci-Fi, 1982)
30		Silent Rage (Action, Horror, Sci-Fi, 1982)
30		Swamp Thing (Horror, Sci-Fi, 1982)
30		Lifepod (Sci-Fi, Thriller, 1981)
30		Halloween III: Season of the Witch (Horror, Mystery, Sci-Fi, 1982)
30		Soylent Green (Mystery, Sci-Fi, Thriller, 1973)
30		Scanners (Action, Horror, Sci-Fi, 1981)
30		The Man with Two Heads (Horror, Sci-Fi, 1972)
30		The Forgotten (Drama, Horror, Mystery, Sci-Fi, 2004)
30		Xtro (Horror, Sci-Fi, 1982)
30		The Aftermath (Sci-Fi, Thriller, 1982)
30		The Crazies (Action, Horror, Sci-Fi, 1973)
30		Aliens (Adventure, Sci-Fi, Thriller, 1986)
30		Doomwatch (Mystery, Sci-Fi, Thriller, 1972)
30		The Creature Below (Horror, Sci-Fi, 2016)
30		The Asphyx (Horror, Sci-Fi, 1972)
30		1990: The Bronx Warriors (Action, Sci-Fi, Thriller, 1982)
30		Z.P.G. (Sci-Fi, Thriller, 1972)
30		Horror Express (Horror, Sci-Fi, 1972)
30		The Twilight People (Adventure, Horror, Sci-Fi, 1972)
30		Garden of the Dead (Sci-Fi, Horror, 1972)

Notes: Movies similar to Tentacles, Movies like Tentacles, Horror, Sci-Fi, Thriller, Ovidio G. Assonitis, John Huston, Shelley Winters, Bo Hopkins, Henry Fonda, SF, Science Fiction, SciFi, Sci Fi, Films, Video, Movie Similarities