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Minecraft Java 1.21 Mods

Browse 31 free mods for Minecraft Java 1.21 — popular picks include Loginar Storage, Alien Origins (Ben 10 omnitrix), Arachnids.

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Loginar Storage
1.21neoforge

Loginar Storage

Storage and inventory improvements... and alien squid dudes

152kdownloads
Alien Origins (Ben 10 omnitrix)
1.21fabric

Alien Origins (Ben 10 omnitrix)

Adding origins to the game based of the Ben 10 aliens!

114kdownloads
Arachnids
1.21.1fabric

Arachnids

Arachnids is a mod based on the first Starship Troopers movie and 2005 game about an alien race of bugs.

59kdownloads
Alien Cat
1.20.1forge

Alien Cat

Trade Other-Wordly items with your new friend! the alien cat!

54kdownloads
Gecko King's Aliens vs Predator Mod
1.21.1neoforge

Gecko King's Aliens vs Predator Mod

This is a mod about the Aliens and Predator franchises; adding xenomorphs, anathema (pathogens), and yautjas to your worlds.

24kdownloads
galactic create
1.21.1neoforge

galactic create

A massive Create addon introducing oxygen mechanics, custom planets, inter-dimensional spacecraft, alien mobs, and procedural space structures.

12kdownloads
AVP: Alien
1.21.1neoforge

AVP: Alien

A module for the AVP universe that adds alien content.

10kdownloads
Creature From The Stars
1.21.1forge

Creature From The Stars

Adds a deadly alien infection

6.3kdownloads
Phenominae: Cryptid Creatures & Strange Encounters
1.21.1neoforge

Phenominae: Cryptid Creatures & Strange Encounters

Add cryptid creatures in your world like aliens, monolith and more!

6.1kdownloads
mc extremo 3 mod
1.21.1fabric

mc extremo 3 mod

A mod that aims to faithfully recreate the Minecraft Extremo 3 experience from Eufonia and AuronPlay, including hardcore lives, danger levels, PvP, vengeance mechanics, custom HUD elements, and special events.

4.3kdownloads
Cobblemon No Man's Craft Compatibility Patch
1.21.1

Cobblemon No Man's Craft Compatibility Patch

Fixes Cobblemon not spawning and asphyxiating on alien planets

2.5kdownloads
Phineas and Ferb
1.21.1neoforge

Phineas and Ferb

Phineas and Ferb mod, will add characters from the animated series Phineas and Ferb to the game.In your world, there will be:Phineas, Ferb, Isabella, Baljit, Buford, Candace,Stacy,Vanessa,Norm,Dr. heinz doofenshmirtz. Of the functions, the mod will add aci

2.3kdownloads
Aliens & UFOs
1.21.8fabric

Aliens & UFOs

A mod that adds Aliens, their spaceships and much more!

1.9kdownloads
The Dababy Modification 2
1.21.1neoforge

The Dababy Modification 2

Explore an alien dream like world, encounter unique mobs, use new mechanics, and see Dababy's face on every texture

1.6kdownloads
Aliens Vs Predator: Resurrection - Aliens
1.21.1neoforge

Aliens Vs Predator: Resurrection - Aliens

A continued project, cloned with permission, of the new alien vs predator mod.This module adds alien content.

1.4kdownloads
Project Parasites
1.21.1fabric

Project Parasites

An alien parasite crash-lands via meteor, corrupting terrain across four escalating phases while adaptive swarm AI hunts you down — craft countermeasures, gear up in hazmat armor, and purify your world before it's consumed.

1.2kdownloads
Aliens Vs Predator: Resurrection - Humans
1.21.1neoforge

Aliens Vs Predator: Resurrection - Humans

A continued project, cloned with permission, of the new alien vs predator mod. This module is the human part of the AVP module Suite.

857downloads
Little Visitor
1.21.1neoforge

Little Visitor

A mod that adds little alien dudes to your Minecraft world

735downloads
Aliens Vs Predator: Resurrection - Predators
1.21.1neoforge

Aliens Vs Predator: Resurrection - Predators

A continued project, cloned with permission, of the new alien vs predator mod.

727downloads
Dababy Mod 2
1.21.1neoforge

Dababy Mod 2

Explore an alien dream like world, encounter unique mobs, use new mechanics, and see Dababy's face on every texture

593downloads
The Gifted
1.21neoforge

The Gifted

Unlock abilities by surviving danger, injecting powerful serums, or experimenting with alien tech and mutation.

229downloads
Chaos Engine
1.16

Chaos Engine

Chaos Engine adds events to the server (UFO, meteorite, glitch events, and others), custom enchantments, and careers. The plugin also includes a weapon system, cases, a casino, and much more!

175downloads
Dawn Of The Pyro Brothers
1.21fabric

Dawn Of The Pyro Brothers

Fight the aliens forged of fire

128downloads
Alienated
1.21.8neoforge

Alienated

Adds a whole new planet to explore!

54downloads
alienation craftation
1.21.8neoforge

alienation craftation

someone asked me to add this to modrinth so heres the modrinth port/edition of my chaotic and very confusing aliens mod!

48downloads
Better Ghast Remastered Resource Pack (1.21.1, 1.20.1) – Texture Pack
1.21.1

Better Ghast Remastered Resource Pack (1.21.1, 1.20.1) – Texture Pack

Better Ghast Remastered Resource Pack overhauls the Ghast mob, transforming it into a more imaginative version that resembles jellyfish or other sea creatures. The pack features eight unique micropack models, each offering a different take on the Ghast, with designs that evoke an alien or cosmic aesthetic. While retaining the classic Ghast face and tentacles, […]

Xenomorph Vanguard Mod (1.21.1) – Survive Lethal Alien Infestations
1.21.1

Xenomorph Vanguard Mod (1.21.1) – Survive Lethal Alien Infestations

Xenomorph Vanguard Mod brings dangerous extraterrestrial creatures, intelligent hive colonies, and protective chitin gear to Minecraft. You face a complete alien lifecycle starting from hidden eggs and clinging parasites up to towering queens. The mod also lets you gather alien drops to build tough armor sets, harvest growth-changing jellies, and explore dark resin-covered territory. Features: […]

Prismatic Wormhole Voids Mod (1.21.1, 1.20.1) – Travel Through Wormholes
1.21.1

Prismatic Wormhole Voids Mod (1.21.1, 1.20.1) – Travel Through Wormholes

Prismatic Wormhole Voids Mod introduces the Ultra Space dimension into Minecraft alongside five alien biomes. You can travel across dimensions by walking through floating entity wormholes that appear naturally in your world. Each area features distinct landscapes and strange environmental traits using vanilla blocks. The mod runs on its own without needing extra creature mods […]

Subnautica Ember Mod (1.21.8) – Survive Giant Leviathans in the Deep Ocean
1.21.8

Subnautica Ember Mod (1.21.8) – Survive Giant Leviathans in the Deep Ocean

Subnautica Ember Mod brings the deep-sea survival of Subnautica into your game. It fills your oceans with new alien creatures, underwater biomes, and hidden dangers. You start in calm waters but must dive into dark caves and deep trenches to find new things. The mod also adds an infection sickness that makes survival harder as […]

Nexus Infection Mod (1.21.1, 1.20.1) – Survive a Spreading Plague That Mutates
1.21.1

Nexus Infection Mod (1.21.1, 1.20.1) – Survive a Spreading Plague That Mutates

Nexus Infection Mod unleashes a dangerous plague that slowly takes over your Minecraft world. When you place a bed, strange creatures start visiting you at night to spread the corruption. The infection turns the ground into dead blocks, mutates friendly animals into undead monsters, and grows alien trees. It also builds massive underground hives filled […]

Brainium Mod (1.21.1, 1.20.1) – Battle Parasitic Brain Bosses
1.21.1

Brainium Mod (1.21.1, 1.20.1) – Battle Parasitic Brain Bosses

Brainium Mod unleashes a parasitic alien infection upon your Minecraft world. It starts when a mysterious meteor crashes from the sky, bringing tiny brain creatures that look for hosts. These parasites drain energy from other mobs to grow into powerful bosses. You must fight back using new guns and special armor before the alien growth […]