A group of twelve individuals are granted ancient powers and mecha to aid their quest in defending earth from alien threats.

The Chou Sei Shin Series (Ultra Star God Series) is a trilogy of tokusatsu shows aired from 2003-2006. Created by Toho (who famously produced the Godzilla movies) and Konami, it was their attempt to break into the Henshin Hero market that was - at the time - dominated by Toei and their two major franchises, Super Sentai and Kamen Rider, with Tsuburaya's Ultra Series for good measure. The shows revolve around the title Ultra Star Gods: Humongous Mecha that are used by the protagonists to protect the Earth from an extraterrestrial threat. This is the first entry was Chou Sei Shin Gransazer, that aired in 2003. The Earth was once a highly advanced civilization until it was attacked by the Alien Alliance. The Earth built giant mecha known as Ultra Star Gods to defend themselves, but even with their power the Earth was eventually defeated. Millions of years later, the Lost Technology of that ancient civilization is stirring, awakening the ancient DNA lying dormant in twelve chosen warriors that calls them to fight a new alien threat once more. The twelve heroes- the Gransazer- were each named after a star sign and arranged into four elemental Tribes: Fire, Wind, Earth and Water. The main protagonists are the Fire Tribe, and the three other Tribes originally enter as antagonists to them, either directly or indirectly. When all three members of a Tribe gather, they can awaken and summon their respective Ultra Star Gods.—TVTropes

Chouseishin GranSazer (Chouseishin Guranseizaa), translated as Super Star God GranSazer, is a Japanese tokusatsu that aired from October 4, 2003 to September 25, 2004. Produced by Toho Company, Ltd., the series ran for a total of 51 episodes and served as the first installment of Toho's SeiShin (Star God) series. Some 400,000,000 years after an advanced human civilization was destroyed by an alliance of planetary conquerors known as Warp Monarch, 12 direct descendants of the civilization's warriors (called Sazers) awaken their powers and join forces with the other members of one their ancestors' four tribes: Flame, Wind, Earth and Water. Each Sazer is based on a Zodiac sign represented in an animal totem or spirit representation. At first, they wage war on each other, but after learning the truth of their ancestry and their reason for awakening, the GranSazer tribes unite to protect Earth from the Warp Monarch from once again extinguishing all life on the planet.—Tokupedia

Also known as Super Star God Gransazers, which is the translated Japanese title, The Gransazers was Toho's successful Saturday morning show that began airing in 2003. The production was a large collaboration, with other companies involved including TV Tokyo, Konami, and Gansis. The program also inherited several key players from the Godzilla franchise, including special effects director Koichi Kawakita, who came out of retirement for the series, along with Kenji Suzuki and Kunio Miyoshi, who both directed numerous episodes. The story of the show focuses on the descendants of an advanced human civilization, which was wiped out billions of years ago during a conflict with a terrestrial race called the Astral Allies. The twelve descendants, called Sazers, form four separate tribes: Fire, Wind, Earth and Water. Each Sazer posses extraordinary powers, and is able to control the Gransazers, mammoth war machines constructed by their ancient ancestors. At first, the tribes begin to wage wars amongst each other on Earth, until they discover that the Astral Allies are planning another strike, this time with the intent of wiping out humankind. Upon this revelation, the tribes join forces to mobilize a resistance against the invaders, and protect the future of all life on Earth. The show ended up marking the first entry in what would later be called the "Super Star God" series. Follow ups include The Justirisers and Super Fleet Sazer-X, the latter of which also had its own movie, Super Fleet Sazer-X the Movie: Fight. Soldiers (2005), that features characters from all three shows.—Toho Kingdom

Billions of years after an advanced human civilization was destroyed by aliens, twelve direct descendants of the civilization's warriors called "Sazers" have their powers awakened and form four tribes: Fire, Wind, Earth and Water. At first, they wage war on each other, but after learning the truth of their ancestry, the GranSazer tribes unite to protect Earth from the alien forces bent on once again extinguishing all life on the planet.—animenewsnetwork