Fictional Alien Species Index: Every Alien and Mutant Race by Franchise, Home World and Threat Level
Every species and mutant strain in the Aliens & Mutants in Fiction hub in one table, from the Xenomorph and the Borg to ALF, Marvin the Martian and the Yip Yips: where it is from, which franchise it belongs to, when it first appeared and how much of a threat the fiction makes it. Sort any column, filter by franchise or category, and follow a name to its full profile.
Showing 60 of 60 species
Every species, sortable
| ALF (Melmacians) | ALF | Melmac (destroyed) | 1986 ALF (TV series) | Alien | Peaceful |
| Asgardians | Marvel Comics | Asgard (later New Asgard, Norway) | 1962 Journey into Mystery #83 | Alien | Guarded |
| Borg | Star Trek | Delta Quadrant (the Unicomplex) | 1989 Star Trek: The Next Generation, "Q Who" | Alien | Existential |
| Bugs (Men in Black) | Men in Black | Unknown | 1997 Men in Black (film) | Alien | Hostile |
| Coneheads (Remulakians) | Coneheads | Remulak | 1977 Saturday Night Live | Alien | Peaceful |
| Cybertronians | Transformers | Cybertron | 1984 Transformers (toy line, Marvel comic and cartoon) | Alien | Hostile |
| Daleks | Doctor Who | Skaro | 1963 Doctor Who, "The Daleks" | Alien | Existential |
| Decapodians | Futurama | Decapod 10 | 1999 Futurama, "The Series Has Landed" | Alien | Peaceful |
| E.T.'s species | E.T. the Extra-Terrestrial | The Green Planet (novels only) | 1982 E.T. the Extra-Terrestrial (film) | Alien | Peaceful |
| Engineers | Alien | Unnamed (outposts on LV-223 and Planet 4) | 1979 Alien (as the Space Jockey; named in Prometheus, 2012) | Alien | Existential |
| Ewoks | Star Wars | Endor (forest moon) | 1983 Return of the Jedi (film) | Alien | Guarded |
| Gems (Steven Universe) | Steven Universe | Homeworld | 2013 Steven Universe (TV series) | Alien | Dangerous |
| Godzilla | Godzilla | Earth (the Pacific; Odo Island) | 1954 Gojira (film) | Mutant | Hostile |
| Great Gazoo | The Flintstones | Zetox | 1965 The Flintstones, "The Great Gazoo" | Alien | Peaceful |
| Greys | UFO lore / The X-Files | Zeta Reticuli (per the lore) | 1975 The UFO Incident (NBC TV film) | Alien | Dangerous |
| Gromflomites | Rick and Morty | Unnamed (Galactic Federation) | 2015 Rick and Morty, "Mortynight Run" | Alien | Dangerous |
| Groot (Flora colossus) | Marvel Comics | Planet X | 1960 Tales to Astonish #13 | Alien | Guarded |
| Gungans | Star Wars | Naboo | 1999 The Phantom Menace (film) | Alien | Peaceful |
| Heptapods | Arrival | Unknown | 1998 "Story of Your Life" (Ted Chiang) | Alien | Peaceful |
| Hulk (mutate) | Marvel Comics | Earth (a New Mexico gamma-bomb test site) | 1962 The Incredible Hulk #1 | Mutant | Dangerous |
| Hutts | Star Wars | Nal Hutta (originally Varl) | 1983 Return of the Jedi (film; named in dialogue in 1977) | Alien | Dangerous |
| Irkens | Invader Zim | Irk | 2001 Invader Zim (TV series) | Alien | Hostile |
| Kanamits | The Twilight Zone | Unnamed | 1950 To Serve Man (Damon Knight story) | Alien | Existential |
| Kang and Kodos (Rigellians) | The Simpsons | Rigel VII | 1990 The Simpsons, "Treehouse of Horror" | Alien | Dangerous |
| Killer Klowns | Killer Klowns from Outer Space | Unknown | 1988 Killer Klowns from Outer Space (film) | Alien | Hostile |
| Klingons | Star Trek | Qo'noS | 1967 Star Trek, "Errand of Mercy" | Alien | Dangerous |
| Kree and Skrulls | Marvel Comics | Hala; Skrullos (later Tarnax IV) | 1962 Fantastic Four #2 (Skrulls; the Kree in #65, 1967) | Alien | Hostile |
| Kryptonians | DC Comics | Krypton (destroyed) | 1938 Action Comics #1 | Alien | Guarded |
| Little Green Men (Toy Story) | Toy Story | Pizza Planet claw machine (toys) | 1995 Toy Story (film) | Alien | Peaceful |
| Martians | The War of the Worlds | Mars | 1898 The War of the Worlds (novel; serialized 1897) | Alien | Hostile |
| Martians (Mars Attacks!) | Mars Attacks! | Mars | 1962 Mars Attacks (Topps cards) | Alien | Existential |
| Marvin the Martian | Looney Tunes | Mars | 1948 Haredevil Hare (short) | Alien | Hostile |
| Monstars (Nerdlucks) | Space Jam | Moron Mountain | 1996 Space Jam (film) | Alien | Guarded |
| Mork (Orkans) | Mork & Mindy | Ork | 1978 Happy Days, "My Favorite Orkan" | Alien | Peaceful |
| Na'vi | Avatar | Pandora (a moon of Polyphemus, Alpha Centauri A) | 2009 Avatar (film) | Alien | Guarded |
| Ninja Turtles | Teenage Mutant Ninja Turtles | Earth (the New York sewers) | 1984 Teenage Mutant Ninja Turtles #1 (Mirage) | Mutant | Peaceful |
| Omicronians | Futurama | Omicron Persei 8 | 1999 Futurama, "When Aliens Attack" | Alien | Dangerous |
| Pod people | Invasion of the Body Snatchers | Unknown (spores drifting between worlds) | 1954 The Body Snatchers (Collier's serial; novel 1955) | Alien | Hostile |
| Prawns | District 9 | Unknown | 2009 District 9 (film; the short "Alive in Joburg", 2006) | Alien | Guarded |
| Reapers | Mass Effect | Dark space beyond the galactic rim | 2007 Mass Effect (game) | Alien | Existential |
| Roger | American Dad! | Unnamed | 2005 American Dad! (TV series) | Alien | Dangerous |
| S.T.A.L.K.E.R. and Metro mutants | S.T.A.L.K.E.R. / Metro | Earth (the Chernobyl Exclusion Zone; the Moscow Metro) | 2005 Metro 2033 (novel; S.T.A.L.K.E.R. game 2007) | Mutant | Dangerous |
| Solomons (3rd Rock) | 3rd Rock from the Sun | Unnamed (the Home Planet) | 1996 3rd Rock from the Sun (TV series) | Alien | Peaceful |
| Spider-Man (mutate) | Marvel Comics | Earth (New York) | 1962 Amazing Fantasy #15 | Mutant | Peaceful |
| Stitch (Experiment 626) | Lilo & Stitch | None (engineered in Jumba's lab) | 2002 Lilo & Stitch (film) | Alien | Guarded |
| Super mutants and ghouls | Fallout | Earth (Mariposa Military Base, California) | 1997 Fallout (game) | Mutant | Dangerous |
| The Thing | The Thing | Unknown | 1938 "Who Goes There?" (John W. Campbell) | Alien | Hostile |
| Time Lords | Doctor Who | Gallifrey | 1963 Doctor Who (the Doctor; named "Time Lord" in 1969) | Alien | Guarded |
| Tribbles | Star Trek | Iota Geminorum IV | 1967 Star Trek, "The Trouble with Tribbles" | Alien | Guarded |
| Uncle Martin (Martians) | My Favorite Martian | Mars | 1963 My Favorite Martian (TV series) | Alien | Peaceful |
| Visitors | V | Fourth planet of Sirius (by their own account) | 1983 V (NBC miniseries) | Alien | Hostile |
| Vogons | The Hitchhiker's Guide to the Galaxy | Vogsphere | 1978 The Hitchhiker's Guide to the Galaxy (BBC Radio 4) | Alien | Hostile |
| Vulcans | Star Trek | Vulcan (40 Eridani A) | 1966 Star Trek, "The Man Trap" | Alien | Peaceful |
| Wookiees | Star Wars | Kashyyyk | 1977 Star Wars (film) | Alien | Guarded |
| X-Men mutants | X-Men | Earth | 1963 The X-Men #1 | Mutant | Dangerous |
| Xenomorph | Alien | Unknown (found on LV-426) | 1979 Alien (film) | Alien | Hostile |
| Yautja (Predator) | Predator | Yautja Prime | 1987 Predator (film) | Alien | Dangerous |
| Yip Yips | Sesame Street | Mars | 1971 Sesame Street | Alien | Peaceful |
| Yoda's species | Star Wars | Unknown (never named) | 1980 The Empire Strikes Back (film) | Alien | Peaceful |
| Zerg | StarCraft | Zerus (origin); Char | 1998 StarCraft (game) | Alien | Existential |
Mutant is the umbrella for every altered Earth-born being; where Marvel's own vocabulary says mutate, a human changed after birth rather than born different, the name says so. Threat is how the fiction treats the species, from peaceful to existential. Sorting and filtering happen in your browser; the full list is always in the page, and every name links to the species profile in the Aliens & Mutants in Fiction hub.