Transformers: Robots in Disguise

An evil race of transforming robots known as the Destronger make their appearance known by invading a world exposition in New York and abducting Professor Onishi, a renowned scientist. The professor's son Yuuki befriends Fire Convoy and the heroic Cybertron forces, who will stop at nothing to rescue the professor and protect Earth from the wrath of Gigatron and his Destron henchmen. (Source: Anime News Network)

Brain Adventure Record Webdiver

Set in the year 2100 where the world is tied together by a computer network. The children of the world become Web Divers, adapting their consciousnesses into data, and love to play together in the cyber park called Magical Gate. However, a mysterious computer virus appears beginning to destroy Magical Gate from the inside out. In cyberspace, programs called Web Knights have been created to protect the children. But, the computer virus has turned all the Web Knights against the children. The only Web Knight to escape the "brainwashing" is Gladion. Gladion seeks the help of Kaito Yuki, a Web Diver who is in the fourth grade. (Source: Anime News Network)

Spider Riders

In this Earth, there exists unknown underground world, the Inner World. In the world, there are braves who fight with large spiders, and they are called “Spider Riders”. According to his grandfather’s diary, a boy, Hunter Steel is traveling around. Meanwhile he happens to enter the Inner World from a pyramid. There, the war between the insect squad that aims at conquest of the Inner World and Spider Riders continues. Oracle, the fairly of the Inner World, summons Hunter because he thinks Hunter will be the messiah of the world. However, the powers of Oracle are sealed by Mantid who is the rule of the Insecter. For the peace of the Inner World, he has to find four sealed keys of Oracle to retrieve Oracle’s power. Hunter asks Spider Shadow, which is a big spider chosen by Oracle, to become a member of Spider Riders to fight against enemies. (Source: AnimeNfo)

Yuusha Raideen

After a slumber of 12 millennia, the Demon Empire returns to seize control of the Earth. Reideen, the giant robot-like protector of the lost continent of Mu, senses the evil presence and awakens within its golden pyramid, revealing to young Japanese boy Akira Hibiki that he is the one descendant of the ancient Mu people who must help Reideen save Earth. He was assisted by his friends, token girl Mari Sakurano (daughter of a scientist fighting the Demon Empire) and several members of his high school soccer team. (Source: AniDB)