Movies Like Gappa, the Triphibian Monster

If you liked Gappa, the Triphibian Monster (1967), a horror and science fiction movie directed by Haruyasu Noguchi, here are 20 movies with a similar feel, based on TMDB's recommendations. Each one links to its cast, trailer and where it's streaming.

1
Godzilla (1954)
★ 7.6/10Also horror and science fiction
Japan is thrown into a panic after several ships are sunk near Odo Island. An expedition to the island led by Dr. Kyohei Yamane soon discover something far more devastating than imagined in the form of a 50 meter tall…
2
Gamera vs. Barugon (1966)
★ 6.4/10Also action and science fiction
Gamera escapes from his rocket enclosure and makes his way back to Earth as a giant opal from New Guinea is brought back to Japan. The opal is discovered to have been an egg that births a new monster called Barugon…
3
Godzilla vs. SpaceGodzilla (1994)
★ 6.7/10Also action and science fiction
A mysterious extraterrestrial being resembling Godzilla rapidly approaches Earth. The monster, dubbed SpaceGodzilla, lands to challenge the King of the Monsters.
4
Space Amoeba (1970)
★ 6.4/10Also science fiction and horror
When a space probe crash-lands on a far-flung Pacific atoll, the craft's alien stowaways decide to take over their new world one creature at a time. Soon, the parasitic life forms latch onto three indigenous critters…
5
King Kong vs. Godzilla (1962)
★ 6.8/10Also science fiction and action
The advertising director of Pacific Pharmaceuticals, frustrated with the low ratings of their sponsored TV program, seeks a more sensationalist approach. He orders his staff to Faro Island to capture King Kong for…
6
Rodan (1956)
★ 6.5/10Also horror and science fiction
Mining engineer Shigeru investigates the disappearance and death of his fellow coworkers when prehistoric nymphs are discovered emerging from the mines. After an attack on the local village, Shigeru heads deeper into…
7
Godzilla, King of the Monsters! (1956)
★ 6.5/10Also science fiction and horror
During an assignment, foreign correspondent Steve Martin spends a layover in Tokyo and is caught amid the rampage of an unstoppable prehistoric monster the Japanese call 'Godzilla'. The only hope for both Japan and the…
8
Godzilla vs. Megalon (1973)
★ 6.2/10Also action and science fiction
Inventor Goro Ibuki creates a humanoid robot named Jet Jaguar. It is soon seized by an undersea race of people called the Seatopians. Using Jet Jaguar as a guide, the Seatopians send Megalon as vengeance for the…
9
Ebirah, Horror of the Deep (1966)
★ 6.3/10Also science fiction and action
Searching for his brother, Ryota stows away on a boat belonging to a criminal alongside two other teenagers. The group shipwrecks on Letchi island and discover the Infant Island natives have been enslaved by a…
10
Godzilla Raids Again (1955)
★ 6/10Also science fiction and horror
Two fishing scout pilots make a horrifying discovery when they encounter a second Godzilla alongside a new monster named Anguirus. Without the weapon that killed the original, authorities attempt to lure Godzilla away…
11
Gamera: The Guardian of the Universe (1995)
★ 7.4/10Also science fiction and action
A ship runs aground on a mysterious atoll leading to an investigation by insurance representative Kusanagi, who discovers an ancient bead that he gives to his daughter Asagi. Meanwhile, ornithologist Nagamine…
12
Gigantis, the Fire Monster (1959)
★ 6.4/10Also action and horror
A prehistoric monster called Gigantis emerges alongside another creature named Angurus.
13
King Kong Escapes (1967)
★ 6.1/10Also action and horror
An adaptation of the Rankin/Bass cartoon, "The King Kong Show". King Kong is brought in by the evil Dr. Who to dig for Element X in a mine when the robot Mechani-Kong is unable to do the task. This leads to the machine…
14
Gamera, the Giant Monster (1965)
★ 5.9/10Also action and horror
A nuclear explosion in the far north unleashes Gamera, the legendary flying turtle, from his sleep under the ice. In his search for energy, Gamera wreaks havoc over the entire world, and it's up to the scientists…
15
Frankenstein Conquers the World (1965)
★ 6.7/10Also horror and science fiction
During WWII, Germans obtain the immortal heart of Frankenstein's monster and transport it to Japan to prevent it being seized by the Allies. Kept in a Hiroshima laboratory, it is seeming lost when the United States…
16
Gamera 2: Advent of Legion (1996)
★ 7.5/10Also science fiction and horror
A strange meteor lands in Japan and unleashes hundreds of insect-like "Legion" creatures bent on colonizing the Earth. When the military fails to control the situation, Gamera shows up to deal with the ever-evolving…
17
Gamera vs. Gyaos (1967)
★ 6.1/10Also action and horror
Unusual volcanic activity in Japan awakens Gyaos, a bloodthirsty flying monster with the power to slice things in half with an ultrasonic ray. While scientists and the military scramble to devise a way to stop this new…
18
Godzilla 2000: Millennium (1999)
★ 6.9/10Also action and science fiction
An independent group of researchers called the Godzilla Prediction Network (GPN) actively track Godzilla as he makes landfall in Nemuro. Matters are further complicated when a giant meteor is discovered in the Ibaragi…
19
Creature from the Black Lagoon (1954)
★ 6.8/10Also horror and science fiction
When scientists exploring the Amazon River stumble on a “missing link” connecting humans and fish, they plan to capture it for later study. But the Creature has plans of his own, and has set his sights on the lead…
20
Invasion of Astro-Monster (1965)
★ 6.8/10Also science fiction and action
Astronauts Glenn and Fuji investigate Planet X and encounter mysterious aliens known as the Xiliens, who ask Earth's people to help save their world from "Monster Zero". In exchange for borrowing Godzilla and Rodan…