Most of the monsters in this series are mindless beasts showing no sign of being rational creatures only near the end do intelligent, but still hostile, aliens appear. For the first seventeen episodes there is no mention of the monsters coming to Earth from space, they're just here as if they have always been here just hibernating. Then in episode eighteen a MAT space station is attacked by a monster from space, Bemstar. Even after monsters from space start appearing there are still other monsters that were already here. The first inteligent alien (seijin), Alien Zelan, doesn't appear until episode thirtyone.
Episode 1: Takkong & Zazahn - two fighting sea monsters, Takkong kills Zazahn also kills Go, Hideki who was rescuing a boy and a dog, before returning to the ocean
Episode 1: Arstron aka Earthron - attacked a mountain village, first monster killed by Ultraman Jack (reappears in Ultraman Mebius episode 20)
Episode 2: Takkong - finally killed by Ultraman Jack after attacking on oil refinery
Episode 3: Sadola (reappears in Ultraman Taro episode 25 & Ultraman Mebius episode 5) & Detton - fight each other and Ultraman Jack
Episode 4: Kingsaurus III - radioactive dinosaur which can generate an energy shield to block Ultraman Jack's energy weapons, wins the first fight with him
Episodes 5 & 6: Gudon (reappears in Ultraman Mebius episodes 2, 9, 27) & Twin Tail (reappears in Ultraman Mebius episodes 6 & 9) - although the Gudon is trying to kill the Twin Tail in order to eat it, the Twin Tail is not smart enough to side with Ultraman Jack or MAT in its own defense, Twin Tail is killed by Gudon and then Ultraman Jack kills the Gudon
Episode 7: Gorbagos - can change its color to blend it to its surrounding so well its invisible except for its eyes, so MAT had to spray it with different colors of paint to keep it visible
Eoisode 8: Ghostron - all but blind but has excellent hearing, only hostile when a threat gets close to it
Episode 9: Dangar - sleeping in a cave awoken by Minami trying to seal the cave with dynamite to keep it in the cave
Episode 10: Stegon - named by Sakata, Jiro and the other children at his school this dinosaur fossil came to life much to the delight of the children and the dismay of the adults, like Ghostron its actions were purely defensive, first monster Ultraman Jack does not kill, he uses a paralysis beam on it, then carries it into space where it becomes a constilation
Episode 11: Mognezun - ate mustard gas left over from World War II and used it to kill (this episode was ment as a commentary against the Japanese military using such weapons)
Episode 12: Shugaron - doesn't like noise made by automobiles disturbing the peace of the mountains it lives in
Episodes 13 & 14: Seamons & Seagorath - a pair of sea monsters, Seamons is the female, Seagorath is the male, Seamons comes to shore to lay her eggs, when attacked by Japanse military against the advice of MAT, she shummons her mate, Seagorath can through his horn create a tsunami (devistating several fishing villages), when both are together their horns can cause tsunamis and tornaodes (threatening to wipe out Tokyo), they surive batteling Ultraman Jack to return to the depths of the ocean
Episode 15: Eledortus - a tortise monster which feeds on electricity and can make itself invisible, named by a boy who's father was killed by it
Episodes 16 & 17: Terochilus - the Ultras always seem to have trouble with bird monsters, this one is no exception
Episode 18: Bemstar - first monster to actually be shown as coming to Earth from space (reappears in Ultraman Taro episodes 29 & 30 & Ultraman Mebius episode 18)
Episode 19: Sartan - arrives on Earth in what appears to be a harmless meteorite, can make itself transparent, so it can't be hurt
Episode 20: Magnedon - magnetic monster which feeds on Earth's magneti field, Ultraman Jack has to carry it into space to another planet to battle it there
Episode 21: Beacon - this space monster hides in the clouds to attack jet planes and it broadcasts its attack on television Tokyo, New York, Hawaii and Moscow all reported seeing it
Episode 22: Gokinezula - hides in garbage dump to eat PVC, same monster was in New York 3 hours before
Episode 23: Zanika & Vacuumon - Zanika fled to Earth to escape from Vacuumon so Ultraman Jack doesn't kill it, Vacuumon so huge it swallows constellations, it ate the Big Dipper and goes after Cancer, where Zanika comes from
Episode 24: Kupukupu/Kingstron - a meteor crashing to Earth left this little monster, MAT afraid it may get bigger and hostile shot it with a laser gun, it blew up and a little boy found a piece of it which grew into the monster MAT feared it would become
Episode 25: Zagorath - a space monster which crashed to Earth long ago and was trying to use a giant magnetic meteor to go back into space, but the meteor had a village built on top of it
Episode 26: Nokogirin - crashed to Earth in the form of a beetle (larger than any real life beetle I've seen but not monster size) than after being zapped with a laser gun it grows to man size than after crawling around underground it for some unknown reason giant sizes
Episode 27: Gronken - a monster from Earth. its top paws have built in buzz saws
Episode 28: Varricane - a sea monster in the form of a giant jellyfish, it can generate typhoons, jellyfish must be huge in Japan because Goh, Hideki; Sakata, Ken and Sakata, Jiro's reponse to seeing this giant jellyfish in the sky is "what's that jellyfish doing in the sky? It should be in the water", they're not phased at all about the size of it
Episode 29: Yadokarin - a hermet crab monster uses MAT Space Station 5 as a shelll, JIro is trapped inside it
Episode 30: Oxter - strange buffalo monster come sout of a lake and kills people who disturn a buffalo grave yard near the lake
Episode 31: Alien Zelan - first inteligent alien to come to Earth, disguised as a boy a deaf boy Kazama, Teru who befriend Captain Captain Ibuki's daughter Minako, telepathically communicates with Goh, Hideki threating him and Ultraman Jack but everone else in MAT thinks he's just a harmless kid and that Goh has gone crazy, he could have solved the problem by telling the commander he is Ultraman Jack but then that would have made it a very short episode, the boy's true form only appears for a few seconds at the end of the episode as he dies in a very bloody, gruesome death killed by the captain, Alien Zelan does not giant size
Episode 31: Plooma - monster controlled by Alien Zelan
Episode 32: King Maimai (larva), King Maimai (adult) - an Earth monster distrubed by humans trying to dig a tunnel to connect two villages, it has two forms, larva and adult, a kind of moth, MAT nearly kills it, blowing offf one limb, but then its sheds its skin to become the adult form. Ultraman Jack actually appears human sized in order to avoid crushing a boy trapped in a cave with Goh. after carrying the boy to safety he runs toward the monster and giant sizes.
Episode 33: Alien Mates - this is an episode about the irrational hatred of prejudice, a human sized alien who has come to Earth with no hostile intent, is weakened by the politiion in and around Tokyo and does not have the strength to recover his buried space craft to go home, he befriends a boy who tries to dig up the ship, the locals become confinced that the boy is the alien and want him dead just because they think he's an alien (I wish Goh had pointed out that Ultraman is an alien). the non-hostile alien is murdered when he reveals himself to to people threatening the innocent boy, much to Goh's digust but he's too kind to let the people get what they deserve to be killed by the giant monster, although he intiially considers it thinking they brought this on themsevles(Alien Mates' son appears in Ultraman Mebius episode 32 seeking revenge 35 years after his father's death, the episode suggests that the boy who befriended his father and tried to find his lost ship did eventually find it and left Earth in it it, which may be how the son learned what happened to his father, note the people adults and children are more tolerant of aliens in 2006 and try to befriend the son)
Episode 33: Muruchi - Alien Mates giant pet, hibernating underground, it comes out and goes on a rampage after its master is killed by humans (not MAT) (a new version Zoa Muruchi is in Ultraman Mebius episde 32, Zoa is "hatred" in the Mates language)
Episode 34: Leogon - a scienist, who is a an old school friend of Goh, mixes plant and animal DNA to create a new life form, something goes wrong and his creation grows into a giant and turns on its creator (script written by a 16 year old boy, years later he would write a similar story for the movie "Godzilla vs Biolante [1989], which I despise, I cant stand the 1980s, 1990s, Godzilla movies and haven't bothered to see the 2000s)
Episode 35: Pris-Ma - another Earth monster, a crystal monster. attracked to light it destroys ships and light houses on its way to Japan, MAT realizes it would just absorb the energy from their normal weapons so they try freezing it, the prolem is cold is also Ultraman Jack's weakness [I don't understand that, aliens who fly through space being weakned by cold] and once its dead he has to quickly fly out of the cold and Goh colapses on the grass as he waits for the sunrise to warm him, second episode in which Ultraman Jack appears human sized
Episode 36: Draculas - insane male alien vampire from the planet Carmilla, which possed the body of a dead woman, Suzumura, Midori so it could exist in the day on Earth, pretending to be the dead woman's (non-existant) younger sister Michiko, it wants to wipe out the human race by destroying all of its females (an insanely impossible scheme as it couldn't possibly kill billions of women by itself and even if it could it would then take decades for all the male humans to die off), although he suspects it an alien, Jiro, upon hearing a vampire is on the lose still wears garlic around his neck and carries a cross for protection, even though it has only killed 15 young women from wealthy families not working class boys, Draculas only appears in its true giant sized form at night, after MAT shoots down its space ship when it tries to move to some other part of the planet, its space craft cold not possibly have held it in giant form, Ultraman Jack killls Draculas by transforming the Ultra Bracelet into a cross and stabbing the alien vampire in the chest
Episodes 37 & 38: Alien Nackle - alien disguised as scientist his minions (appear human too) murder Ken and Aki (Alein Nackle reappears in Ultraman Mebius & The Ultra Brothers movie)
Episodes 37 & 38: Black King - Alien Nackle's monster which he sends to defeat Ultraman Jack (who it turns out cared about Ken and Aki as much as his host), Alien Nackle joins the fight and Ultraman Jack loses and is sent into space to die at the end of episode 37. Episode 38 is mostly a MAC episode as MAC tries to deal with the alien invaders without Ultraman Jack, each of the men foolishly attempt to attack the aliens's base in Tokyo and end up- hypnotized with leaving Oka, Yuriko only MAC member on Earth not controlled by the aliens, Ultraman and Ultra Seven rescue Ultraman Jack (that's all they do), he destroys the alien fleet but once back on Earth Goh, Hideki and Oka, Yuriko have to fight the other MAC members before Goh, still in shock over the death of his two closest friends, heads to the alien's Tokyo base to fight Black King and Alien Nackle again and nearly loses again, MAC goes looking for bombs the aliens planted using explosives stolen from MAC, of course they find them, Goh asks for leave, and the captain must know about Ken and Aki because he grants it without question, Goh goes to his apartment(?) looking for Jiro but hears his voice from another apartment and finds Jiro with a strange woman decorating a Christmas tree (turns out its Jiro's cousin who will take care of Jiro from now on)
Episode 37: Seagorath & Bemstar - revived by Alien Nackle, used to test Ultraman Jack in combat before Alien Nackle and Black King confront him (recycled clips from episodes 13 & 18)
Episode 39: Alien Varduck - once every 12 years for 240 yeats the Varduck have been visiting to Earth to learn about it before conquering it thus creating the legend of the yeti, this Varduck takes possesion of a man to hide its true identity before giantsizing and trying to freeze Tokyo as they finally begin their invasion
Episode 40: Alien Black & Snowgon - Alien Black and Snowgon posses an old man and his granddaughter to hide their true identities, they freeze newlywed couples then put them inside space ships to send them to their planet, they got away with 5 couples before being caught, they wanted to adbuct 1000 young couples to produce a new bleed of slaves on their planet, humansized Snowgon appears as "Snow Woman" and blows cold air, after Goh shot her in the back she giantsized and revealed her true form, Alien Black does not giantsize but Ultraman Jack zaps him anyway
Episode 41: Alien Baltan Jr. & Builgamo - Jiro awakens from a dream in which his brother Ken is warning him about a meteor, when the meteor arrives Jiro sees an Alien Baltan appear, laugh and than vaniish, he tries to tell Goh but Goh doesn't believe him, he think JIro is sick with a fever and missing his brother (probably true) but in fact Alien Baltan Jr has arrived seaking revenge for his father's death at the hand of Ultraman Jack's brother five years ago, and has brought with him the robot Builgamo (Alien Baltan originally appears in Ultraman episodes 2, 16, 33)
Episode 42: Alien Stora & Paragon - Alien Stora attempts to conquer Earth with the monster Paragon which can bend ligh to create optical illusions resulting in car crashes and MAT aircraft shooting at each other or nearly crashing into each other and also firing on villagers, Alien Stora only appears to laugh at MAT, wants to conquer the Earth to turn into a Stora vacation resort planet. alien and monster are so closely linked that when Ultraman Jack kills Paragon the alien dies too
Episode 43: Alien Grotes & Kodaigon - At the urging of his subordinates Captain Ibuki goes on leave to spend time with his wife and daughter, diguised as a villager Akien Grotes targets the captain believeing his death with result in the disbanding of MAT, uses a serum from his planet to bring the statue Kodaigon to life and to keep MAT from acting abducts the captains wife and daughter (a different Kodaigon appears in Ultraman Mebius episode 12)
Episode 44: Alien Centaurus & Granadas - Alien Centaurus is sent to Earth by her kind to destroy MAT's new radar system and she brings with her the monster Granadas but disguised as human woman she falls in love with Kishida, Fumio (and he with her), inventor of the new radar and learns to like humans, Goh and Ultraman Jack are so closely bonded that he can see through the Ultra's eyes that the woman is an alien and she seems to recognize him as an Ultraman, famed guardian of the universe why her kind are destroyers, she only shows her true form at the end and never turns her face toward the camera
Episode 45: Alien Messie, Alien Cygnus-61, Robonez - evil Alien Messie abducted and forced peaceful Alien Cygnus-61 to create Robonez a giant, fire spitting robot rat to kill Ultraman Jack, the monster is actually destroyed in the first 4 minutes of the episode, controlled by Alien Messie the girl then plants a pen with a bomb in it on a female passanger who boarding an airplane Goh, Hideki was planning on boarding for a sking vacation but canceled on a doctor's advice, after Goh was bitten by a rat, Cygnus-61 enters school and gives Jiro a pen bomb in another attempt to blow up Goh, Hideki; Alien Messie takes control of the doctor treating Goh for the rat bite (and who ruined the second attempt to kill Ultraman Jack by blowing up Goh) after the doctor drugs Goh, Alien Messie finally shows itself and sprays gas at Goh, believing he's killed Goh and thus Ultraman Jack, he giantsizes to destroy Tokyo but MAT was ready for its appearance so it picks up the girl and the doctor to use as hostages
Episode 46: Alien Zoole & Red Killer - Alien Zoole disguised as an artist pushes a child off a bridge onto the street in front of MAT Car and then tells the crowd that gathered that Goh was driving too fast and ran over the boy, later the artist contacts his superior who orders him to use Red Killer (which isn't actually red) to cause chaos, first time we've seen an alien not on Earth give orders to his subordinate on Earth, the artist only reverts to his true form after he's shot dead by MAT and then his body vaporizes, Red Killer is armed with twin boomarangs
Episode 47: Femigon - first monster from Earth since the start of the alien invasion, Goh, Hideki and Minami, Takeshi are missing after MAT Arrow 1 suffers a mysterious malffunction and crashes into the sea Oka, Yuriko starts screwing up on the job so the captain sends her home on a month's leave to rest up, leaving the team short handed to fight this monster,when it suddenly appears, and the captain doesn't understand why Oka doesn't at least phone to ask to return early upon hearing about the monster on the news, turns out there is an inexpliable connect between Oka and this female monster (reappears in Ultraman Mebius episode 33)
Episode 48: Sasahiller & Yametaranese - Sasahiller is an alien which tries to conquer the Earth through a monster that spreads laziness, Yametaranese, oddly enough the first human it encounters a young boy, is already lazy so it has the opposite effect, he suddenly wants to learn and rushes off to school, spreading the lazy virus to everyone he meets, while everyone else is lazi he actually wants to study but the teacher and all the sudents left so he goes home and makes his normally school and work obbsessed mother lazy, people try to phone MAT but in the middle of the call they announce "I quit" and stop carrying, Yametaranese which started out small grows huge, but isn't hostile or intentionally destructive, its just too lazy to go around buildings so it slowly walks through them, MAT tries to fight the monster buty they quit too, once Ultraman Jack hurls Yametaranese back into Space, Sasahiller finally appears as a giant to fight himself
Episode 49: Alien Mysteler (good) & Alien Mysteler (evil) - once again Go, who is on leave, recognizes an alien disguised as a human after the "man" saves the life of a young boy which surprises him because this alien race is known for its aggressiveness and hostility, Goh and the Alien Mysteler communicate telepathically, the alien says he likes humans and wants to live in peace with them, unknown to Goh and this Mysterler another has arrived on Earth to capture human warriors to force into battle against their enemies the Astral whom they have been fighiting for 30 years, and has already captured the rest of MAC and is after Goh now
Episode 50: King Bockle - sent to conquer the surface world by inteligent lifeforms (never scene) living below the Earth's surface, so guest this would count as last Earth based monster of the series {reoccuring theme in Ultraman series, a subterrainian race at odds with the surface world which doesn't even know it exists)
Episode 51: Alien Bat & Zetton II - Alien Bat dreams of conquering the Earth and the Land of Light brings a new version of Zetton to Earth to klll Ultraman Jack, Alien Bat is actually first seen in Maruno, Rumiko;s dream in which her wedding to Goh, Hideki is interrupted by the groom and rest of MAC running off to deal with some unspecified threat, leaving her to face Alien Bat alone, in reality she and Jiro are already the alien's prisoners (Zetton originally from Ultraman episode 39), (a computer generated Zetton appears in Ultraman Mebius episode 27)
