The Reconstructive Experiment Empire Mess is an interstellar empire that conquers planets and uses their lifeforms as material for its genetic experiments.
Its ultimate goal is to transform Great Emperor Lar Deus into the strongest being in the universe, using conquered worlds, stolen lifeforms, and experimental monsters to advance that ambition.
The flying saucer headquarters of the Reconstructive Experiment Empire Mess. Base Labor serves as the empire's mobile command center, laboratory, and launch point for operations against Earth.
The supreme ruler of Mess and the central figure behind the empire's genetic experiments. Lar Deus seeks to become the strongest being in the universe by absorbing and manipulating life energy gathered from conquered worlds.
In the final stage of the conflict, he becomes the monstrous Za Deusoola, forcing the Flashmen into their decisive battle against the empire's ruler.
The empire's chief geneticist and the creator of the Beast Warriors. Lee Keflen conducts the experiments that combine Earth and alien genes into dangerous hybrid monsters.
Though he serves Mess as one of its most important scientists, he is originally from Earth, tying him directly to the Flashmen's home planet and the tragedy surrounding their childhood abductions.
A winged, zebra-like field commander serving Mess. Ley Wanda is a dangerous warrior who carries out the empire's field operations and battles the Flashmen directly.
He can transform into the bestial Wandarla, becoming a more savage and physically powerful threat in combat.
A catlike field commander of Mess and one of the empire's most prominent operatives. Ley Nefel uses cunning, elegance, and cruelty while serving Great Doctor Lee Keflen and Lar Deus.
She can transform into the bestial Nefelura, becoming a more monstrous and aggressive combat form during battle.
A white-furred, blue-skinned brute field commander serving the Reconstructive Experiment Empire Mess. Garus relies on raw strength and intimidation, acting as one of the empire's early major battlefield threats.
He appears from Episodes 1-28.
Nefelura's feline assistants and loyal attendants. Ulk and Kilt support Ley Nefel during Mess operations, often helping with infiltration, harassment, and field missions against the Flashmen.
The boss of the Alien Hunters and one of the most important enemies in the Flashmen's past. Armed with a whip, Sir Cowler is responsible for kidnapping the five Earth babies who would grow up to become the Flashmen.
His arrival brings the truth of the team's origins closer to the surface and makes the conflict with Mess deeply personal.
Episodes 15-48
The second-in-command of the Alien Hunters. Bo Gardan serves under Sir Cowler and supports the hunters' operations during the later phase of the war against the Flashmen.
Episodes 43-48
The green-eyed, red-skinned insectoid foot soldiers of Mess. Zorors are deployed in large numbers to support Beast Warriors, guard the empire's facilities, and overwhelm the Flashmen during field battles.
A group of bounty hunters and abductors associated with Sir Cowler. Their known members include Baura, Hag, Kerao, Hou, and one unnamed member.
They are directly tied to the kidnapping of children from Earth, including the five who would later return as the Flashmen.
A jellyfish-like creature used by Mess to enlarge monsters. Kraagen allows defeated Beast Warriors to grow to giant size, forcing the Flashmen to respond with their mecha.