Goldran follows the adventures of three young boys who are tasked with finding alien robot fighters, or Braves, that are sleeping in the form of crystals. Their major antagonist is the flamboyant and thoroughly incompetent Walter, and the villains that follow him are often similarly humorous. 
(Source: Wikipedia)

When aliens plan to invade earth, the young Kouta along with a giant robot from outspace named Exkaiser must team up to save the world and his friends.

In 2010, an evil Minus-Energy Lifeform called Draias has made his way to Earth, and allies himself with an evil scientist known as Dr Jango to create chaos and ruin the planet. A unit dispatched from the peacekeeping Space Police Force follows him to Earth, and their leader Fighbird inhabits the body of an advanced android built by Dr. Hiroshi Amano, becoming Yuutarou Katori. Katori and his team, inhabiting various Earth vehicles and accompanied by Dr. Amano's grandchildren Kenta and Haruka, fight against Draias's forces while adapting to life on Earth. 

(Source: Brave Series Wiki)

Seiji Takasugi obtained a jewel called "Aurin" which is the earth's alter ego and it has elected him to be the commander of eight brave robots. The Brave robots are sleeping in many parts of the world as "Brave Stones". However, they become super robots by fusing with modern people and machines once Seiji awakens them and they soon follow his instructions. Their enemy is Lord Oh-Boss who is an invader who aims at stealing the planet's energy with the aid of his subordinates that Da-Garn and the other brave robots must stop in order to save the world. 
(Source: Wikipedia)

Nouvelle Tokio City locates on the place where it used to be Tokyo Bay. At the first glance, the prosperous city seems to enjoy its freedom and peace, but the city is suffering from the crimes. 
Senmuji Maito is a perfect 15-year-old boy, bright, handsome, smart, and all-around sportsman. Furthermore, he is the leader of Senpuji Trading group, and a multimillionaire. He spends his private fortune to found "Brave Express Squad" which consists of several robots. They are the robots that have various special abilities. Above all, the leader, Gaine, has a super artificial intelligence and has own personality. They can transform into trains. In case of incidents, they will appear anywhere in the world using the highly developed railway system.

Grade schooler Yuuta Tominaga stumbles upon Deckerd, a humanoid robot under construction by the Japanese police, built to fight advanced forms of crime. Yuuta's constant contact with Deckerd gives the robot a "heart", or personality; when Yuuta is recruited as the "boss" of the "Brave Police" as a result, a true human/robot partnership occurs. 
(Source: Wikipedia)

A huge space monster appeared in a city and began to destroy the city. People were escaping with screaming. Among them, there were five high school students, En, Kai, Shin, Yoku, and Ryu. However, they failed to escape, and they rushed into a patrol car parked nearby. The monster was approaching to them. When they began to accept their death, the patrol car glowed blue white and disappeared into a mysterious space carrying them. When they were astonished, it was an alien that appeared in front of them. He was a Bravian who is an officer of the Space Police Organization that was responsible for the peace and order of the universe. He explained them that he was aimed at by ferocious aliens in the Space Prison Sargasso. He added that he had given them a battle machine "Dag Beagle" made by copying machines on the Earth in order to fight against Sargasso. 
They turned into Dagwon by the power of Bravian, and fought against space monsters. At that moment, the patrol car came in front of En. En grew into the car and turned into the Brave Robot Dag Fire, then beaten the enemy. However, the fight between the Brave Dagwon and the felonious aliens of Sargasso had just begun.

In the year 2005, a race of alien monsters called Zonders emerge from underground and launch a series of attacks on the city of Tokyo. The only defense against these creatures is the secret agency known as the Gutsy Geoid Guard (or 3G) and their ultimate weapon, the awesome giant robot GaoGaiGar. GaoGaiGar's pilot, Guy Shishio, is a former astronaut who was nearly killed two years before when the Zonders first crashed to earth. Guy's life was spared when a mysterious robot lion called Galeon pulled him from the burning shuttle and brought him to Earth. Guy's father, Leo, then used Galeon's technology to rebuild his shattered son as a cyborg, in the hopes that he could stop the aliens when they appear. Now, with Galeon as its core, GaoGaiGar fights to protect Earth. He is aided by a team of transforming robots and by a young boy named Mamoru, who has the power to purify the Zonders' cores, and seems to be connected to the mysterious Galeon.
 
(Source: Anime News Network)

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