United States-based list, last updated 4/25/18.



Netflix



Mystery Science Theater 3000 (TV 1988-1999, 2017) [ Gorgo, Reptilicus and Yongary, Monster from the Deep episodes]

(TV 1988-1999, 2017) [ and episodes] King Kong (2005)

(2005) Kong: King of the Apes (TV 2016)



(TV 2016) Godzilla: Planet of the Monsters (2017)

(2017) The Cloverfield Paradox (2018)

Filmstruck/Starz (the latter also available through Amazon Channels)

Godzilla (1954)

(1954) Godzilla Raids Again (1955) [sub]



(1955) [sub] Godzilla, King of the Monsters! (1956)

(1956) Rodan (1956) [sub]



(1956) [sub] Mothra vs. Godzilla (1964) [sub]

(1964) [sub] Invasion of Astro-Monster (1965) [dub]

(1965) [dub] The War of the Gargantuas (1966) [international dub]

(1966) [international dub] The X from Outer Space (1967) [Filmstruck only]



(1967) [Filmstruck only] Son of Godzilla (1967) [sub]

(1967) [sub] Destroy All Monsters (1968) [sub]



(1968) [sub] All Monsters Attack (1969) [sub]



(1969) [sub] Godzilla vs. Megalon (1973) [dub]

(1973) [dub] Godzilla vs. Mechagodzilla (1974) [dub]



(1974) [dub] Terror of Mechagodzilla (1975) [dub, no prologue]

(1975) [dub, no prologue] King Kong (1976) [Starz only]

(1976) [Starz only] Jellyfish Eyes (2013) [Filmstruck only]

Crunchyroll (free)

Ultraman Leo (TV 1974-1975) [SD]

(TV 1974-1975) [SD] Ultraman 80 (TV 1980-1981)

(TV 1980-1981) Ultraman Gaia (TV 1998-1999)

(TV 1998-1999) Ultraman Nexus (TV 2004-2005)

(TV 2004-2005) Ultraman Max (TV 2005)

(TV 2005) Ultraman Mebius (TV 2006)

(TV 2006) Death Kappa (2010)



(2010) Ultraman Ginga (TV 2013)



(TV 2013) Ultraman Ginga S (TV 2014)



(TV 2014) Ultraman X (TV 2015)

(TV 2015) Ultraman Orb (TV 2016)

(TV 2016) Ultraman Geed (TV 2017)



Amazon Prime Video



Warning from Space (1956) [”public domain” copy]



(1956) [”public domain” copy] Varan the Unbelievable (1962)

(1962) Matango (1963) [dub]

(1963) [dub] Gammera the Invincible (1966) [HD but missing all shots of fighter pilots]



(1966) [HD but missing all shots of fighter pilots] Gappa the Triphibian Monster (1967) [”public domain” copy]

(1967) [”public domain” copy] Gamera vs. Guiron (1969) [”public domain” copy]



(1969) [”public domain” copy] Space Amoeba (1971) [international dub]



(1971) [international dub] Queen Kong (1976)

(1976) Reptilian (1999)

(1999) Demeking the Sea Monster (2009)

(2009) Mega Shark vs. Crocosaurus (2010)



(2010) Atlantic Rim (2013)



(2013) Mega Shark vs. Mecha Shark (2014)

(2014) Mega Shark vs. Kolossus (2015)



(2015) 10 Cloverfield Lane (2016)



(2016) Kong: Long Live the King (2016)

Toku (add-on subscription with Amazon Prime Video)

Ultraman 80 (TV 1980-1981)

(TV 1980-1981) Gridman (TV 1993-1994)

(TV 1993-1994) Ultraman Neos (TV 2000-01)

(TV 2000-01) Ultraman Nexus (TV 2004-2005)

(TV 2004-2005) Ultraseven X (TV 2007)



(TV 2007) Ultra Galaxy Mega Monster Battle (TV 2007-2008)

(TV 2007-2008) Ultra Galaxy Mega Monster Battle: Never Ending Odyssey (TV 2008-2009)

(TV 2008-2009) Neo Ultra Q (2013)

(2013) Ultraman Ginga (TV 2013)



(TV 2013) Ultraman Ginga S (TV 2014)

(TV 2014) Ultraman Zero: The Chronicle (TV 2017)

Vudu (free, but subtitle timing was done by a speed-reader)



All Showa Gamera films



ShoutFactoryTV (free)

Ultraman Leo (TV 1974-1975) [HD]

(TV 1974-1975) [HD] Elvira’s Movie Macabre (TV 1981-1986) [ Gamera: Super Monster episode ]



(TV 1981-1986) [ ] Add-on subscription with Amazon Prime Video includes all Showa Gamera films and Gamera: Guardian of the Universe (1995)

Hulu

The Host (2006)



(2006) 10 Cloverfield Lane (2016)

(2016) Colossal (2017)

go90 (free)

Ultraman Neos (TV 2000-01)

(TV 2000-01) Ultraseven X (TV 2007)



Fandor

Gorgo (1961)

(1961) Death Kappa (2010)

Shudder

The Host (2006)



(2006) Monsters (2010)

HBO Now/HBO Go (also available through Amazon Channels)