Movies Like Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster

If you liked Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (1976), a action and adventure movie directed by Masayuki Akehi, 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
Mazinger Z: Infinity (2017)
★ 7/10Also action and animation
When the evil Dr. Hell attacks the Earth, the mighty giant mecha Mazinger Z is formed to stop him.
2
Mazinger Z vs The Great Dark General (1974)
★ 8.2/10Also animation and action
Kouji and his friends have defeated Dr. Hell and are now enjoying a break, but suddenly a strange prophet appears and warns everyone of an oncoming danger, mechanical beasts never seen before start appearing all around…
3
Godzilla vs. SpaceGodzilla (1994)
★ 6.7/10Also action and adventure
A mysterious extraterrestrial being resembling Godzilla rapidly approaches Earth. The monster, dubbed SpaceGodzilla, lands to challenge the King of the Monsters.
4
Giant God Warrior Appears in Tokyo (2012)
★ 6.7/10Also action and animation
The short focuses on the God Warrior from Nausicaa of The Valley of The Wind (1984). Super-powered bio-weapons in ceramic armor begin attacking Tokyo, annihilating human civilization.
5
Godzilla vs. Megalon (1973)
★ 6.2/10Also action and adventure
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…
6
Code Geass: Lelouch of the Rebellion I - Initiation (2017)
★ 7.1/10Also animation and action
The world is at war. Lelouch Lamperouge, an exiled prince, encounters a strange girl known as C.C., who gifts him with a great power. With this ability, Lelouch can get anyone to do as he wills. But the power of Geass…
7
Godzilla vs. Kong (2021)
★ 7.5/10Also action and adventure
In a time when monsters walk the Earth, humanity’s fight for its future sets Godzilla and Kong on a collision course that will see the two most powerful forces of nature on the planet collide in a spectacular battle…
8
Code Geass: Akito the Exiled 4: Memories of Hatred (2015)
★ 6.1/10Also action and animation
While W-0 is away, Leila and the remaining crew at base find themselves surrounded by Britannian Knightmares. Piloting the Vercingetorix, Shin Hyuuga leads the enemy charge, having usurped the position of Grand Master…
9
Pacific Rim (2013)
★ 7/10Also action and adventure
Using massive piloted robots to combat the alien threat, Earth's survivors take the fight to the invading alien force lurking in the depths of the Pacific Ocean. Nearly defenseless in the face of the relentless enemy…
10
Kaiju No. 8: Mission Recon (2025)
★ 8/10Also animation and action
In a Kaiju-filled Japan, Kafka Hibino works in monster disposal. After reuniting with his childhood friend Mina Ashiro, a rising star in the anti-Kaiju Defense Force, he decides to pursue his abandoned dream of joining…
11
Code Geass: Akito the Exiled 3: The Brightness Falls (2015)
★ 6.4/10Also action and animation
After discovering the face of their true enemy, someone who is related to Akito and responsible for the Geass placed upon him, W-0 attempts to return to their base at Castle Weisswolf. However, stranded in Warsaw due…
12
Godzilla: The Planet Eater (2018)
★ 6.5/10Also animation and action
With no means for defeating Godzilla Earth, mankind watches as King Ghidorah, clad in a golden light, descends on the planet. The heavens and earth shake once again as the war moves to a higher dimension.
13
Transformers: Beginnings (2007)
★ 6.9/10Also animation and action
On their home planet of Cybertron, the Autobots and Decepticons are involved in an explosive battle over the coveted AllSpark. With the fate of the universe at stake, the Autobots send it far from the reaches of the…
14
Gigantis, the Fire Monster (1959)
★ 6.4/10Also action and adventure
A prehistoric monster called Gigantis emerges alongside another creature named Angurus.
15
Code Geass: Akito the Exiled 2: The Wyvern Divided (2013)
★ 6.3/10Also action and animation
The war between Euro Britannia and the European Union continues. New orders are given to the W-0 Unit. To land in the middle of the enemy territory as a diversion. The pilots of the W-0 Unit consist only of the…
16
Patlabor 2: The Movie (1993)
★ 7.4/10Also animation and action
A Japanese police unit who use giant anthropomorphic robots (called Labors) is caught up in a political struggle between the civilian authorities and the military when a terrorist act is blamed on an Air Force jet…
17
Godzilla vs. Mechagodzilla II (1993)
★ 7.2/10Also action and adventure
The U.N.G.C.C. (United Nations Godzilla Countermeasure Center) recovers the remains of Mecha-King Ghidorah and construct Mechagodzilla as a countermeasure against Godzilla. Meanwhile, a giant egg is discovered along…
18
Monsters vs Aliens (2009)
★ 6.3/10Also animation and adventure
When Susan Murphy is unwittingly clobbered by a meteor full of outer space gunk on her wedding day, she mysteriously grows to 49-feet-11-inches. The military jumps into action and captures Susan, secreting her away to…
19
Godzilla vs. Mechagodzilla (1974)
★ 6.9/10Also action and adventure
An Okinawan prophecy that foretells the destruction of the Earth is seeming fulfilled when Godzilla emerges to return to his destructive roots. But not all is what it seems after Godzilla breaks his ally Anguirus's…
20
Gurren Lagann The Movie: Childhood's End (2008)
★ 7.6/10Also action and animation
Simon and Kamina live in an underground city monitored by the village chief. When Simon stumbles upon an artifact and beastmen invade from the surface, Simon and Kamina rebel against them.