Absolutely Invincible Raijin-Oh) is a 51 episode Japanese anime television series, and the first generation Eldran franchise funded by Tomy and produced by Sunrise.

It aired in Japan from April 3, 1991 to March 25, 1992 and later be succeeded by the second generation of the Eldran series Genki Bakuhatsu Ganbaruger.

The company began selling the first volume of the series direct from their website, as well as several other online retailers as of late December 2009.

Using the heroic robot Raijin-Oh, Eldran attempts to thwart the Evil Empire by preventing a missile from striking Earth.

Tsutomu is a smart, polite, stubborn, and a typical nerd with bobbed hair and thick glasses who likes to study and research.

Akira Imamura is an operator of core robots's starting system and weapon selector of Bakuryu-oh.

Akira is a pretentious sore loser and a punk boy who wants to be a rock star, and had put the mesh in his hair.

Hiroshi Takamori is a vice-commander in the Earth Defense Class, safety manager of Raijin-Oh's weapons, and sub pilot of Bakuryu-oh.

Orie Ishizuka, known as "Potato", is Hou-oh's all sensor systems monitor, and Raijin-oh's damage counter.

Cookie is a short, big-eyed girl who likes adorable things, but has strong dependence on others and can't do anything on her own.

Tokie Sakai is Jyu-oh's sensor systems monitor, and Bakuryu-oh's damage counter manager.

Daisuke Sato is Ken-oh's circuit system monitor, launcher of Bakuryu Cannon fire, and main mechanic of robots.

Daisuke is the tallest and biggest student in the class, but a gentle, shy boy, and the eldest son of large family.

Aiko is a mature, tall girl who is good at sports, and is a physical education committee member.

Mr. Shinoda is a young passionate teacher who loves the students, but he has often been disturbed a lesson by Evil Beasts.

The 65-year-old principal of Hinobori Elementary who is a good supporter for 5th Grade Class 3. he's master of Tai Chi, also adviser of Kenpo club.

He appears in all of the Eldran franchise when the years went on progressing, such as dealing the cases of The Demon World in Aozora, the Mechanization Empire in Harukaze and the Onigashima in Gokuraku.

He is the warrior of light who gave Raijin-oh to the Earth Defense Class in order to defeat the Evil Empire.

Belzeb's Alter ego, Falzeb is small woman look-like fairy with silver-haired and kimono.

living in sub-space in Belzeb's chest, Falzeb turns devil face at the time irradiation the Jark Power.

Taidar is hired at Hyuga Store later, he appeared as a minor character also Genki Bakuhatsu Ganbaruger frequently.

Ken-Oh (literally "Sword King") is a humanoid robot, piloted by Jin, the leader of the trio.

After the evil commander Belzeb (short for Beelzebub or Satan) was given a giant crystal robot named Jaaku Satan by Emperor Warza (literally "evil emperor") to assists the Jaaku Beasts in destroying Raijin-Oh, the Raijin-Oh soon realized that it was unable to defeat its enemies alone.

Raijin-Oh was a tremendously popular series at the time of its release, spawning two similar sequels and OVAs.

This led to waves of similar TV shows in the early 90s, where a child or children were made into the pilots of giant robots.

This was a significant change of pace for the mecha genre, which usually pursued an older demographic and used teenage or adult characters as pilots.

The spiritual successors contain many plot elements that directly similar to Raijin-Oh's premise, characters, but, with the exception of not having a school to house the robots or an Eldran-like being to create them.

Otherwise, Raijin-Oh had little worldwide impact, despite some success in Southeast Asian countries like China and Taiwan.

Raijin-Oh was featured in the New Century Brave Wars game, along with several of the Yuusha series robots, also created by Sunrise at around the same time.

It also appeared in New Century Brave Wars on the PlayStation 2 in Japan to establish the first official connection between the Eldran and Yuusha series, following the merger of Takara and Tomy.