Godzilla vs. the Sea Monster

1966 film by Jun Fukuda

Godzilla vs. the Sea Monster is a 1966 film about a young man, who steals a boat to find his brother, but he and his shipmates become shipwrecked on a mysterious island inhabited by a giant sea monster and a slumbering Godzilla.

Directed by Jun Fukuda. Written by Shinichi Sekizawa.
This is one lobster you don't want to order!  (taglines)

Dialogue

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Nita: What kind of laboratory, or a factory, is this?
Ichino: No idea.
Nita: I thought you studied science?
Ichino: But I didn't pass the first year. One thing's for sure, this place doesn't make toys.

Yoshimura: I did it, it's unlocked! Hurry! Let's go inside!
Ichino: Ow! Don't come in! It's a nuclear reactor!
Yoshimura: So that's it, it's a heavy water factory.
Nita: Huh? What can they do with that?
Yoshimura: Atom bombs are made with it.
Nita: Huh? I'm getting out of here!

Daiyo: It could be Mothra's asleep at present. Our prayers will reach its source and it will arrive. Yes, I'm sure Mothra is soon going to hear us!
Nita: It's too bad Mothra has no alarm clock.
Ryota Kane: Don't make fun of her!
Nita: You're really superstitious, eh?

Cast

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Wikipedia
 
  Japanese films     Shōwa series     Godzilla  (1954) · Godzilla Raids Again  (1955) · King Kong vs. Godzilla  (1962) · Mothra vs. Godzilla  (1964) · Ghidorah, the Three-Headed
  Monster
 (1964) · Invasion of Astro-Monster  (1965) · Godzilla vs. the Sea Monster  (1966) · Son of Godzilla  (1967) · Destroy All Monsters
  (1968) · All Monsters Attack  (1969) · Godzilla vs. Hedorah  (1971) · Godzilla vs. Gigan  (1972) · Godzilla vs. Megalon  (1973) · Godzilla vs.
  Mechagodzilla
 (1974) · Terror of Mechagodzilla  (1975)
 
  Heisei series     The Return of Godzilla  (1984) · Godzilla vs. Biollante  (1989) · Godzilla vs. King Ghidorah  (1991) · Godzilla vs. Mothra  (1992) · Godzilla vs.
  Mechagodzilla II
 (1993) · Godzilla vs. SpaceGodzilla  (1994) · Godzilla vs. Destoroyah  (1995)
 
  Millennium series     Godzilla 2000  (1999) · Godzilla vs. Megaguirus  (2000) · Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack  (2001) ·
  Godzilla Against Mechagodzilla  (2002) · Godzilla: Tokyo S.O.S.  (2003) · Godzilla: Final Wars  (2004)
 
  Reiwa series     Godzilla Resurgence  (2016) · Godzilla Minus One  (2023)  
  Foreign films     Adaptations     Godzilla, King of the Monsters!  (1956) · Cozzilla  (1977) · King Kong vs. Godzilla  (1963) · Godzilla 1985  (1985)  
  Co‑productions     Monster Zero  (1970)  
  TriStar Pictures     Godzilla  (1998)  
  Legendary Pictures     Godzilla  (2014) · Godzilla: King of the Monsters  (2019) · Godzilla vs. Kong  (2021) · Godzilla x Kong: The New Empire  (2024)  
  Related films     Rodan  (1956) · The Mysterians  (1957) · Varan the Unbelievable  (1958) · Battle in Outer Space  (1959) · Mothra  (1961) · Gorath  (1962) · Atragon  (1963) · Dogora  (1964)
  · Frankenstein Conquers the World  (1965) · The War of the Gargantuas  (1966) · King Kong Escapes  (1967) · Latitude Zero  (1969) · Space Amoeba  (1970) · The War
  in Space
 (1977) · Gunhed  (1989) · Rebirth of Mothra  (1996) · Rebirth of Mothra II  (1997) · Rebirth of Mothra III  (1998)  
  Television     Zone Fighter  (1973) · Ike! Godman  (1972–1973) · Ike! Greenman  (1973–1974) · Godzilla  (1978–1981) · Godzilla Island  (1997–1998) · Godzilla: The Series  (1998–2000) · Monarch: Legacy of Monsters  (2023–present)  
  See also     King Kong