Movies Like Mega Shark vs. Giant Octopus

If you liked Mega Shark vs. Giant Octopus (2009), a horror and science fiction movie directed by Jack Perez, 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
Deep Blue Sea (1999)
★ 6/10Also horror and science fiction
Researchers on the undersea lab Aquatica have genetically altered the brains of captive sharks to develop a cure for Alzheimer's disease. But there's an unexpected side effect: the sharks got smarter, faster, and more…
2
Dangerous Animals (2025)
★ 6.4/10Also horror
A savvy and free-spirited surfer is abducted by a shark-obsessed serial killer. Held captive on his boat, she must figure out how to escape before he carries out a ritualistic feeding to the sharks below.
3
Splinter (2008)
★ 6.2/10Also horror and science fiction
When their plans for a nature trip go awry, Polly and boyfriend Seth decide to check into a motel. On their way, they're carjacked and kidnapped by low-rent crooks Dennis and Lacey, who take the victims and their SUV…
4
Dagon (2001)
★ 6.1/10Also horror
A boating accident off the coast of Spain sends Paul and his girlfriend Barbara to the decrepit fishing village of Imboca. As night falls, people start to disappear and things not quite human start to appear. Paul is…
5
Deep Rising (1998)
★ 6.2/10Also horror and science fiction
A group of heavily armed hijackers board a luxury ocean liner in the South Pacific Ocean to loot it, only to do battle with a series of large-sized, tentacled, man-eating sea creatures who have taken over the ship first.
6
The Mist (2007)
★ 7/10Also horror and science fiction
After a violent storm, a dense cloud of mist envelops a small Maine town, trapping David Drayton and his five-year-old son in a local grocery store with other local residents. They soon discover that the mist conceals…
7
Alien: Romulus (2024)
★ 7.2/10Also horror and science fiction
While scavenging the deep ends of a derelict space station, a group of young space colonizers come face to face with the most terrifying life form in the universe.
8
Into the Deep (2025)
★ 5.9/10Also horror
Divers searching for sunken treasure witness the murder of drug dealers by modern-day pirates, but a killer great white is determined not to let any of them escape its waters.
9
Screamers (1995)
★ 6.3/10Also horror and science fiction
SIRIUS 6B, Year 2078. On a distant mining planet ravaged by a decade of war, scientists have created the perfect weapon: a blade-wielding, self-replicating race of killing devices known as Screamers designed for one…
10
Extinction (2015)
★ 6.4/10Also horror and science fiction
And suddenly, overnight, the world came to a halt. Two men, two survivors, one kid, and hatred that separates them. A place forgotten by everyone, including the creatures that inhabit the Earth... until now.
11
AVP: Alien vs. Predator (2004)
★ 6/10Also science fiction and horror
When scientists discover something near Antarctica that appears to be a buried Pyramid, they send a research team out to investigate. Little do they know that they are about to step into a hunting ground where Aliens…
12
The Last House (2026)
★ 6.8/10Also horror and science fiction
A family suddenly sealed inside their home must work together to survive against dwindling resources and the ominous threat keeping them trapped.
13
Die Alone (2024)
★ 6.5/10Also horror and science fiction
Lost in a world reclaimed by nature and overrun by mysterious creatures, Ethan, a young man with amnesia navigates the dangerous landscape in search of his lost love Emma. His journey takes an unexpected turn when he…
14
Nightmares (1983)
★ 5.9/10Also horror and science fiction
A collection of short stories. In one a woman who leaves her house late at night to drive to the store while a killer is loose encounters some problems. In the second an arcade whiz kid's obsession with a game leads to…
15
Deep Water (2026)
★ 7.4/10Also horror
A group of international passengers on a flight from Los Angeles to Shanghai is forced to make an emergency landing in shark-infested waters. The terrified group is forced to work together and overcome their…
16
Sweetheart (2019)
★ 6.4/10Also horror
Jenn has washed ashore a small tropical island and it doesn’t take her long to realize she’s completely alone. She must spend her days not only surviving the elements, but must also fend off the malevolent force that…
17
Tremors: A Cold Day in Hell (2018)
★ 5.8/10Also science fiction
Burt Gummer and Travis Welker find themselves in a fight for survival after investigating deadly giant worm attacks in the Canadian arctic.
18
Containment (2015)
★ 5.9/10Also horror and science fiction
Neighbors in a block wake one morning to find they have been sealed inside their apartments. Can they work together to find out why? Or will they destroy each other in their fight to escape?
19
Outlander (2008)
★ 6.5/10Also science fiction
During the reign of the Vikings, a man from another world crash-lands on Earth, bringing with him an alien predator. The man must fuse his advanced technology with the weaponry of the vikings to fight the monster.
20
Death Machine (1995)
★ 5.8/10Also horror and science fiction
Chaank Armaments is experimenting with the ultimate fighting machine which is part human - part machine. So far, the Hardman project has been unreliable and has killed a number of innocent people. The genius behind…