War against Tyrant Zero./War.

The conflict between Tyrant Zero and Blue Cop and his friends arose from the clash between the forces these characters represented: Tyrant Zero sought to destroy the Metal Cardbots, while Blue Cop, on the contrary, tried to help his fellow cardbots adapt to life on Earth without interfering with humans.

Keepers of Secrets Savannard (Savannard) A mystical bot who remembers the origin of the Beastvirus. Savannard's backstory is full of drama: due to his destructive power, he brought much misery to innocents under the influence of the virus, after which he cursed his abilities and went into self-imposed exile, trying to find a cure or a way to tame the beast within him.
Tyrant Zero (Servants of Destruction) Faction: Tyrant Zero: The oldest and most dangerous Wild Cardbot, he has become the primary source of chaos. He succumbed completely to the virus, but instead of madness, he gained a sinister intelligence. His backstory is that of a tyrant who dreams of enslaving both Wild and regular Cardbots, destroying those who do not bend to his might.
Elephant, Giraffe, Zebra (Disciples): Three gigantic savages who swore allegiance to Tyrant Zero. On the planet Machine, they were ordinary workers and heavy bots, but on Earth, the Tyrant subjugated them to his will, turning them into a ruthless, city-destroying guard.

Blaion Tribe (Soleon Tribe)Blaion: Formerly a noble protector of the planet Machina. After contracting the virus, he led the Lion Tribe, trying to preserve the last vestiges of honor and protect his comrades from complete madness. He remained in hiding for a long time until a meeting with Solei and Jun led him to join forces with the Metal Cardbots. Fion: Blaion's most loyal squire and father figure.
Loners and Sky PredatorsTigun / Tigun: A proud lone warrior who has always despised weakness. He transforms into a tank and believes that only absolute strength gives the right to survive. Taigun aligns himself with no tribe and came to Earth with the sole purpose of proving himself the strongest fighter in the universe. Phantom Hornet: A stealthy and cunning infiltrator. On the Machine, he carried out reconnaissance, and under the influence of the Beast Virus, he transformed into a dangerous "ambush hunter." He uses the speed of a hornet to carry out surprise raids and collect Energon. Night Griffon / Night Griffon: An ancient guardian of the airspace. After the collapse of his homeworld, he isolated himself on the highest peaks of Earth. The Griffon attacks any who intrude on his aerial domain, obeying only the call of the sacred Metal Bracelet.
Monohorn TribeSolid Horn: A powerful leader whose tribe has been a longtime rival to Blayon's. He believes lions are too soft. Solid Horn is stubborn, relying solely on his immense physical armor and ramming strength, which has often led to territorial conflicts on Earth.
Rapid Tribe: Tachy and Tachyon: Speedy scouts. Tachyon's backstory is tragic—she fell victim to the devastating effects of the virus and the wars of the past. Tachy was left alone. Her story is one of survival at top speed and a quest for revenge against those who brought the Beast Virus to their home.

The Metal Bracelet's owner is a mysterious girl named Soleil. She is the one who is able to interact with the Wild Cardbots, and her appearance and possession of the sacred treasure Deus Machina raise many questions for Jun and Blue Cop.
List of Scavs. Wild Cardbots are divided into tribes and factions, combining traits of technology and wild animals:
Blaion: The fearless leader of the Soleon Tribe. A strong and noble warrior. In the future, he can combine with Blue Cop into a powerful form - Grand Blue Leon. Fion: A member of the Blaion tribe, a loyal and devoted comrade. Tigun: A proud and arrogant fighter, considering himself the strongest among all savages. He transforms into a powerful tank. Phantom Hornet: A feral bot with elements of a hornet or a wasp. A cunning and swift flyer. Night Griffon: A majestic feral bot with features of a mythical griffin, dominating the air. Solid Horn: The mighty leader of the Monohorn Tribe. Possesses colossal physical strength. Tachy and Tachyon: Members of the Rapid Tribe. Known for their incredible speed. Savannard: A mysterious bot whose memories hold secrets of the past. Savannard has long considered his power a curse due to the destruction brought by the Beast Virus. Ignix: A wild Cardbot that commands fire or energy attacks. Tyrant Zero: An ancient and sinister embodiment of destruction, feared by both normal and Wild Cardbots. A group of followers has rallied around him. Disciples and Followers of Tyrant Zero: A group of large wild Cardbots named after savannah animals: Elephant, Giraffe, Zebra.

Many years ago, in deep space, there existed a high-tech planet called Machine, inhabited by mechanical beings called Metal Card Bots. The power and essence of each of them was contained within a special Metal Card. Due to a massive catastrophe, the planet exploded, and the surviving robots were scattered across the universe. Many of them ended up on Earth, where they were forced to hide from humans, disguising themselves as various types of vehicles (cars, trucks, construction equipment).
Season 1 (2023): The story begins. An ordinary Earth boy named June accidentally discovers the Metal Bracelet—an ancient and powerful artifact from a lost planet. The device responds to it, allowing him to awaken, seal, and control Card Bots. June's first ally is Blue Cop (a police car). Together with his friends, June begins searching for the remaining scattered robots to protect them and help them adapt to Earth. The season's main enemy is the space criminal Heavy Iron, who wields colossal destructive power.
Season 2: Metal Cardbot S (2024–2025) Jun's friend Chris brings back a mysterious stone tablet from archaeological ruins. Jun's touch reactivates the Metal Bracelet, setting off a chain of new events, awakening even more ancient and dangerous Cardbots and threatening the safety of Motown.
Season 3: Metal Cardbot W (2025–2026) After major incidents, humans and robots finally find a way to peacefully coexist. However, this peace is shattered when hidden "wild" bots emerge, guarding the primordial secrets of their race. June and Blue Cop are forced into battle once again.

June

June is the main character for a significant part of the series.

It is he who discovers the world of Cardbots.
Has a bold and inquisitive character.
Usually leads a group of people.
Establishes strong bonds with various Cardbots.
Friends and comrades

The core group also includes friends who help with:

completing missions,
conducting research,

and also with participation in battles.

Names may change depending on the season and translation, but generally each human character has a Cardbot partner.

Basic Cardbots
Blue Cop

One of the most important and recognizable Cardbots.

Its appearance is based on a police car.
Has a serious character and a desire to protect others.
Usually acts as a leader during battle.
Justice and Protection Specialist.

June Grant

The main character.

His Cardbots:
Blue Cop
Mega Trucker
Mega Ambler
Phoenix Fire
Shadow X
Dexter
Fleet-Z
Wild Guard
Buffalo Crush
Buster Gallon
Black Hook
Heavy Iron
Glober
Rock Crush
Blastrain
Flame Nova

June ends up collecting the most Cardbots in the entire series.

Theo

Jun's best friend.

Smart and calm.
Helps by investigating mysteries and gathering information about the Cardbots.
Related Cardbots:

Theo usually helps the main team, but he doesn't have his own permanent Cardbots like Jun. He most often interacts with:

Blue Cop
and other Cardbots from June's group.

Anna

Jun's close friend.

Kind and reasonable.
Often helps the group in difficult situations.
Related Cardbots:

Anna spends a lot of time with:

Blue Cop
Phoenix Fire
Shadow X
Dexter
Fleet-Z
Wild Hardy
Buffalo Crush

Although she, like June, is not a primary user of the Metal Breath.

Chris

A child prodigy and ally of the group.

His main Cardbot:
Wild Hardy

Later becomes Jun's ally and helps him using technology and information.

Peruru

Appears in Metal Cardbot S season.

Related Cardbots:
Siero
Musclehyde
Red Blitz
Deep Bite
Blastrain
Glober
Rock Crush
Gigantrex
She is a descendant of Mukara and eventually joins the main group.

The main, most famous Cardbots
Most important/popular:
Blue Cop → Jun's leader and main partner.
Phoenix Fire → rescuer/firefighter type.
Mega Ambler → ambulance.
Shadow X → ninja / stealth.
Heavy Iron → very strong and heavy.
Wild Hardy → wild and aggressive.