- Greys vs Reptoids vs Nordics
- Grid
- Griffin the Archanan
- Grob (Tom and Jerry)
- Gromflomite
- Ground Alien
- Grummgar
- Gus
- Gwellis Bagnoro
- H'tho
- Hakuja
- Hamalian
- Hammerpede
- Hammerpus
- Hand Sea Monster
- Hands
- Happabore
- Harvester (Independence Day)
- Hatonn
- Heaven's Gate
- Hedley
- Helix-class light interceptor
- Helmet Jellyfish Alien
- Hera Syndulla
- Hibernation Chamber Guardian
- Hill 611 UFO crash
- Hoax
- Hooblot
- Hopkinsville Goblin
- Horn
- Horrible Gelatinous Blob
- Hound of Tindalos
- Howard the Alien
- Human (The Eye of the Beholder)
- Hunter
- Hunter from Beyond
- Hyperdrive
- Hziulquoigmnzhah
- Ice Breathing Dragon
- Ilco Munica
- Imperial Assault Shuttle
- Incalnk
- Incursean
- Independence Day Mothership
- Indrid Cold
- Infinity Guard
- Insectoid
- Insectoid (Brewster Rockit)
- Instant Martians
- Interdimensional Being
- Invictus (Final Space)
- Invictus (Star Carrier)
- Io
- Iron Giant
- Iron Golem
- It
- Ixbee, Pixbee and Squee
- Izby
- J-Rod
- Jabba the Hutt
- Janus VI
- Japanese Spider Crab Alien
- Jar-Jar Binks
- Jasonian/Fishpire
- Jax the Conqueror
- Jeff (MIB)
- Jellion
- Jeremy
- Jerroto
- Jesus
- Joe
- John (Taken)
- John Silver
- Jojo the Klownzilla
- Joozian
- Jordan's Tezcatlipoca
- Jorgen
- Josh Exley
- Jumba Jookiba
- Jumbo
- Jumpgate
- Jungle Felucian
- Jupiterian Werewolf
- K-9
- Kaiju (Pacific Rim)
- Kaiju Skinmite
- Kalenia
- Kanamit
- Kang and Kodos
- Karina the Great
- Karloff
- Keller
- Kelly's Quetzalcoatl
- Keroro
- Kevon's Tezcatlipoca
- Khan Maykr
- Khyber
- Ki
- Kif Kroker
- Killer Klowns
- Kilomidaean
- King Dinosaur
- King Goobot
- King Thingg
- Kirby
- Knifehead
- Kondon
- Koppaites
- Kor-Dem
- Koros-Strohna
- Korosensei
- Krailoni
- Kryptos
- Kururu
- LEGO Alien Conquest
- LV-223
- La Carcagne
- Lanever Villecham
- Lang
- Larga
- Larry Longeyes
- Law of One
- Lazarus-92
- Leaf Dragon
- Leatherback
- Legion
- Lem
- Leroy
- Lester (Taken)
- Leviathan (Gears of War)
- Leviathan (Mass Effect)
- Ligrin
- Lil Mayo
- Lincoln National Forest incident
- List of alleged extraterrestrial beings.
- Little Twelvetoes
- Little green men
- Little green men (Toy Story)
- Lonely One
- Longbourne
- Lord Commander
- Lord Commander's Empire
- Lord Nibbler
- Lost Specimen
- Lrrr and Ndnd
- Lu-La
- Lubbock Lights
- Lunaris
- Lupine Wavelength Haemovariform
- Lurker
- Lycanthrope (Roswell Conspiracies)
- Lyran
- Magori
- Malware
- Mannegishi
- Mantis-Like Creature
- Mantis Alien
- Marianas
- Mark Chang
- Martian
- Martian (Ice Age)
- Martian (It! The Terror from Beyond Space)
- Martian (The War of the Worlds)
- Martian Ambassador
- Martian General Z-9
- Martian Girl
- Martian Leader
- Martian Manhunter
- Martian Werewolf
- Martians (Mars Attacks!)
- Marvin the Martian
- Mass Relay
- Matt's Tlaloc
- Maxilon
- Maxilonian
- Maz Kanata
- McPherson Tape
- Meeper
- Mega-Kaiju
- Mega Trogg
- Megamind
- Megatron
- Mel's Xochipilli
- Men in black
- Mercurian (The Shadow Out of Time)
- Merku From Alcorn
- Mertock
- Metaluna Mutant
- Metepec Alien
- Mi-go
- Mighty Mandrake
- Mikey
- Mini Doraemon
- Minion
- Ministry-class orbital shuttle
- Mogwai
- Mole-Teeth Insect
- Molochopod
- Mongolian Death Worm
- Monster (A Quiet Place)
- Monsters (Pikmin)
- Moon (Local 58)
- Moon Frog
- Moonlander
- Morbo
- Mork
- Morlocks
- Morph
- Mosh Tendrils
- Mothership
- Mothman
- Mr. Kat
- Mr. Swackhammer
- Mr. Wu
- Muculox
- Mutant (Metamorphosis: The Alien Factor)
- Mythilae
- NX-Class
- Namana-class light cruiser
- Neb
- Nehru
- Neptunian Werewolf
- Newborn Xenomorph
- Nikola Tesla
- Nitros Oxide
- Nordic Men
- Nordic alien
- Obi-Wan Kenobi
- Occulan
- Og
- Ogdru Hem
- Ogdru Jahad
- Ogre (Face Off)
- Ogrum
- Oh
- Olimar
- Om Nom
- One Eye Guy
- Oni (Roswell Conspiracies)
- Onibaba
- Onus
- Ooblar
- Oola
- Optimus Prime
- Order of the Twelve
- Orion X
- Otachi
- Paci-Fire
- Pampy
- Pan-Dimensional Being
- Parallax
- Parallel Dimension
- Parasite (Cloverfield)
- Parasite (Ninjago)
- Parasite (Rick and Morty)
- Pascagoula Humanoid
- Patient Zero
- Paul
- Peep (Tom and Jerry)
- Penumbra
- Phidna
- Phoenix Lights
- Pikmin
- Pineal Eye
- Planet 4546B
- Planet X (Dinosaurs vs Aliens)
- Pleakley
- Plejaren
- Porax-38 starfighter
- Potent Poppy
- Pou
- Poultra
- Power Flower
- Pox
- Praster Ommlen
- Praying Maberration
- Precursor (Pacific Rim)
- Predalien
- Predator Temple
- Primus
- Probe
- Pru Sweevant
- Pterobuzzard
- Pting
- Punk Rock Dumpster Dweller
- Purity
- Purple-Skinned Humanoid
- Pylon
- Pyronica
- Pyrox
- Quantonium
- Queen Tyr'ahnee
- Quiggold
- Quinn (Arena)
- R'lyeh
- R2-D2
- Rabbids
- Raijin
- Raiju
- Rancor
- Rathtar
- Ray gun
- Razor Claws
- Reconnaissance Troop Transporter
- Red-Skinned Crustacean
- Reed Case
- Remoolian
- Reptilian
- Reptilian (Godzilla)
- Reptilian (Lost Tapes)
- Reptilian Ringleader
- Reptoid
- Reuben
- Revonnah
- Revonnahgander
- Rhan-Tegoth
- Ripper (Pacific Rim)
- Rlim Shaikorth
- Robby the Robot
- Robot Monster
- Robot Overlord
- Robot Squid
- Roger Smith
- Rogor
- Roman the Fabulist
- Roodown
- Rook Blonko
- Rose Farrar
- Rosebud
- Roswell UFO crash
- Roughback Batfish Alien
- Rudy
- Runner
- Russian UFO crash
- SCP-1560
- SCP-2845
- Saberbat
- Saibamen
- Samus Aran
- Sand Shark
- Sandworms
- Sarco Plank
- Sarris
- Satan
- Satan (Resistance)
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