Terroking
Born from three Growth-posessed humans combining, Terroking goes on a brief rampage in Tokyo, before reverting to it’s human/Growth components who sow the seeds of mistrust in the populace after Madgone threatens to unleash the monster again later that day.
Terroking’s a bit simplistic compared to the previous monsters, but it’s still a real nice saurian monster design. I love the cybernetic legs, as well as trio of fire-spitting hoses on top of his head. Reportedly, Terroking’s tail was the longest of all the monsters seen in Jumborg Ace. The suit itself would be recycled for the monster Bemsa King in Tsuburaya’s other 10th anniversary show, Fireman.
STONE KING
Sent to infiltrate the PAT base during their annual celebration by Madgone, several Growth aliens hide inside a monster-themed mikoshi (a religious palanquin in the Shinto faith). When PAT catches on, the Growth combine with the mikoshi to form the monster Stone King.
As you can see, Stone King is another homage to the classic Ultra kaiju, specifically Dodongo, as well as taking inspiration from the mythical kirin and Pegasus as well. It’s a pretty solid Dodongo tribute, though sadly, Jumborg Ace doesn’t ride him around like Ultraman did back in the day.
CHAMELEON KING
A kaiju that guards Madgone’s undersea base, Chameleon King is an alright kaiju, and looks appropriate for an ocean guard-dog. I like the textured Gomora-esque chest he’s got going, and the long tongue allows for some interesting moments during his fight with Jumborg Ace. Aside from that, he’s just sort of another monster of the week, but not a bad one.
GAIAGNES
A powerful cyborg created by Madgone, the nefarious alien plots to make Gaiagnes an intelligent monster by placing the brains of children into the creature. Sort of a take off of King Tedgon’s concept, the idea of utilizing the brains of children for a kaiju is wonderfully morbid, even if Madgone in the end, has to substitute an electronic brain for the real thing. The design by Yonetani is an impressively large creation, albeit early on during the monster’s battle with Jumborg Ace, he loses his large tail, which is a bit of a shame. I like his long arms, which spray out sparks for his main weapon!
NONBIRIGON
Going a different direction from his previous schemes, Madgone sends the monster Nonbirigon to Earth, and the lazy beast’s lethargy rings cause the local adults to become lazy, providing a good distraction for the Growth aliens hidden inside Nonbirigon to emerge and then place time bombs around the city. While this scheme is foiled by Naoki, the kids plead with him to take pity on the monster, and Jumborg Ace flies the creature into outer space where it can do no harm.
A sort of remake of Yametaranse from Return of Ultraman, I like this portly, comedic character. I think it’s an interesting sort of plan to cause havoc with the monster being a distraction to a smaller scale scheme going on in the background. The design itself by Yonetani isn’t too crazy compared to some of his other Jumborg Ace monsters, but I like how this guy feels like a mixture between a slug and a fat, slobbish mammal like a pig or hippo, perfectly befitting a kaiju who’s main ability is to make people lazy.
JUMKILLER
Created by Madgone to be the ultimate opponent for Jumborg Ace, Jumkiller manages to outfight the Emeraldian robot and damage him to the point where the Cessna needs extensive repairs. While things look grim, the Emerald alien helps Naoki once again by altering Naoki’s Honda Z so that it can transform into the second Jumborg robot: Jumborg 9. Jumborg 9 proves to be just the edge Naoki needs and Jumkiller is destroyed effortlessly.
Arguably the show’s most iconic monster, Jumkiller lives up to his name by being one of the few monsters in the show to outfight Jumborg Ace completely, and while Golden Arm and Deadfire certainly did it first, Jumkiller forces the Emeralds to give Naoki a necessary upgrade to continue to combat the Growth aliens, giving Jumkiller a truly tremendous presence. He lives up to his name. Jumkiller’s design by Yonetani is a pretty good one, looking like a good evil version of Jumborg Ace, and the horns on the head and asymmetrical armored look really fit with the general aesthetic of the demonic Growth commanders. The design was based off of one of the ideas for the second Jumborg robot, but was modified into a villain when Jumborg 9 was chosen instead, making the battle between Jumkiller and 9 a meta gag of sorts.
AIRDOLMEN
A giant robot send by Madgone to steal the blueprints for a new radar that PAT is working on, Airdolmen is the first opponent for the newly repaired Jumborg Ace. I don’t have much to say on this guy, but unlike the other evil robots Madgone has sent to combat our heroes with, Airdolmen is piloted by several Growth aliens, and we do get some fun scenes in the monster’s open-air cockpit (located in his mouth) during the episode. Originally named Eldramen, Yonetani makes mention that this was the first monster seen in Jumborg Ace in awhile that had a gold coloration in his special effects design book.
IMITATION JUMBORG ACE
A perfect replica of Jumborg Ace, Madgone sends out his imitation to frame Jumborg Ace while stealing plutonium that is being sent to PAT. When Naoki attacks the robot with Jumborg 9, the truth is revealed, and the evil Jumborg meets his maker at the hands of the real deal.
Much like the various Imitation Ultras, this character was born from an older Jumborg Ace suit, given a painted head fin and red eyes. However, Yonetani did draw up a design for the Imitation Jumborg Ace, which included some differences from the final suit, such as the chest spikes. Yonetani still got paid for the design work, even if in the end the Imitation Jumborg Ace suit wasn’t based on Yonetani’s design concept.
DOUBLE KILLERS
Analyzing all of the failed plans against Jumborg Ace, Madgone sends out a pair of monsters, the powerful Double Killers to take down Jumborg Ace and 9 once and for all. The powerful monsters live up to Madgone’s expectations as they wipe the floor with Jumborg Ace easily, and even manage to crucify Jumborg 9 as well. Things look grim until a lightning bolt of seemingly divine intervention recharges Jumborg 9 and Naoki is able to use his robots to finally destroy the gruesome twosome.
Among the first Jumborg Ace monsters I became acquainted with, the Double Killers always felt among the most iconic monsters of this show, mainly coming down to their wonderful designs and the fact they’re able to take down both of the Jumborgs with relative ease. They truly do feel like the show’s equivalent to a “midboss”, and while they don’t change the show’s status quo or anything, they truly feel like an event and one of the more dangerous adversaries Naoki has to overcome.
Designed by Yonetani, and perhaps one of the best monster designs he has done period, the Double Killers bring to mind all sorts of things to mind with their designs such as crabs, starfish, manta rays, flames and onis. The coloration of the Double Killers was meant to mirror Jumborg 9’s own color scheme, which makes a nice bit of symmetry with the robotic hero. Since Yonetani designed both of these guys on the same design sheet, he only got paid for one monster design, bit of a shame.
ARMADIGON
Madgone’s final kaiju, Armadigon is sent to interfere with Naoki’s attempt to deliver a special defrosting device to a PAT base that Madgone put on ice (pun intended this time, not sorry). Armadigon is your average armadillo-based tokusatsu monster, and feels very plain when compared to some of the wackier monsters we’ve seen in the show. But, armadillo kaiju are hard to mess up (I swear to god that armadillos were just created by God in order to have a good motif for toku monsters) and Armadigon is a solid armadillo monster. I really like his downward face, almost like he’s getting ready to roll into a ball.
Easter's Kaiju Kompendium 