- Thanos
- Thara
- Tharban
- Thardus
- Thargoid
- Thargon
- Tharil
- Thasian
- Thassor
- The 456
- The Ageless
- The Alliance
- The Ambassador's species
- The Arena
- The Arriani
- The Atlas (No Man's Sky)
- The Beast (Doctor Who)
- The Beast (Shadow Raiders)
- The Beyonders
- The Big Bad
- The Blob
- The Blob (Mr. Bean)
- The Broadcast
- The Burn
- The Cacus
- The Collector
- The Color Out of Space
- The Consortium (Grendel)
- The Core
- The Darkness
- The Doctor
- The Dweller Beneath
- The End
- The Enlightened
- The Entity (Doctor Who)
- The Entity (Strife)
- The Envoy Alien
- The Eraser
- The Escaper
- The Extremes
- The Family
- The First
- The Fisher King's species
- The Five
- The Flood
- The Flood (Doctor Who)
- The Force
- The Friendly Group from Another Planet
- The Fudd
- The G-Man
- The Geefle
- The Giant Polyp
- The Gonk
- The Great Evil
- The Great Intelligence
- The Great One
- The Grid
- The Grinning Man
- The Guardian (Amphibia)
- The Guy
- The Hammer of Light
- The Horse
- The Host
- The Huddle (Inside)
- The Intruder
- The Iron Giant's species
- The Joining
- The Junkman's species
- The Kindred
- The Krawl
- The Kull
- The Machine Men
- The Many
- The Monster Squad
- The Mulefa
- The Multiversal Timeline
- The Network
- The One (Transformers)
- The Overdog
- The Pallbearer
- The People
- The Plague
- The Prospector
- The Puppet Masters
- The Raak
- The Race (Doctor Who and the Brain of Morbius)
- The Race (Worldwar)
- The Raven
- The Red Shiny Robots of Vortis
- The Ringmaster
- The Scourge
- The Shape
- The Shimmer
- The Silent
- The Spacewomen
- The Sphere's Species
- The Spore
- The Swarm (The Invisible Enemy)
- The Swarm (Voidtrain)
- The Teller's Species
- The Thing
- The Thing on Saybrook's Planet
- The Timekeeper
- The Torment
- The Ultimate Alien
- The Undoing
- The Vigil
- The Virus
- The Vril
- The Witness
- The Zarn
- The united galaxies
- Theelin
- Thennanin
- Thennqora
- Thenurian
- Theodore
- Thep Khufan
- Theran
- Therian
- Theril
- Thermasaur
- Thermian
- Thermian (Astro City)
- Thermidorian
- Thern
- Theron Guard
- Thesstrian Flesh-taker
- Theta
- Thetacorian
- Thetan
- Thiaoouban
- Thijarian
- Thimiar
- Thin Man
- Thing (The Thing)
- Thing (The Thing from Another World)
- Thing (Who Goes There?)
- Think Tank
- Thiogen
- Thirdspace Alien
- Thisspiasian
- Thix-Thet
- Tho'rahl'shothan
- Thoat
- Thoi'han
- Tholian
- Tholothian
- Thomas Jerome Newton
- Thoranian
- Thorg
- Thorian
- Thorian (Alien Property)
- Thorn
- Thorn-bush Predator
- ThornTail
- Thorn Beast
- Thornback
- Thorned Mockiwi
- Thoros Alphan
- Those Who Evade the Crone
- Those Who Sit Above in Shadow
- Thoth (A Martian Odyssey)
- Thotheen
- Thought-Beast
- Thraddash
- Thrakian
- Thranta
- Thrantillil
- Thranx
- Thrax (Power Rangers)
- Thrax (Tabula Rasa)
- Threcaldian
- Three-Armed Martian
- Three-Eyed Venusian
- Three Galaxies
- Threeeye
- Thrella
- Threllip
- Threshadon
- Threshchopper
- Thresher (Earthfall)
- Thresher (Lilo & Stitch)
- Thresher Maw
- Threshold Aliens
- Thrint
- Throg
- Throttlebot
- Thrykar's species
- Thrynn
- Thtopar
- Thubanian
- Thul
- Thunderbeast (Alien Worlds: Your Guide to Extraterrestrial Life)
- Thunderian
- Thurman's Species
- Thusali
- Thushol
- Thuun'ha
- Thyresta
- Thyrrus
- Ti-keel
- Tiabo
- Tiabo's pet
- Tibannuck
- Tiberium
- Tick (Spore)
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