The Goseigers are members of the Gosei Angels, humans born with mysterious powers who 10,000 years ago moved to the Gosei World so not to cause trouble for regular humans. Using the Heaven's Tower as a bridge between the dimensions, the Gosei Angels made it their mission to protect Earth. They are divided into three Tribes: the optimistic Skyic Tribe with power over the aerial elements, the tough Landic Tribe with power over the earth and fire elements, and the calm-headed Seaic Tribe with power over the water element. To perform their mission, the Gosei Angels use the mystical Gosei Power sealed away in Gosei Cards. By inserting a Gosei Card into the Tensouder the Goseigers transform and unleash the power of other cards to perform Tensou Techniques to fight evil. Each Goseiger is armed with an individual Gosei Weapon and the Gosei Blaster sidearm. The Goseigers also have interchangeable Gosei Headers that can connect to their Gosei Blasters or enlarge and attach to the five Gosei Machines which combine to form Gosei Great.
Alata/Gosei Red
A member of the Skyic Tribe who has been the childhood friend of Eri. He has an innate ability to see through to the true essence of things. As Gosei Red, he has the Skyic Power of Storm.
Eri/Gosei Pink
A member of the Skyic Tribe who is the most maternal of the group and optimistic about life. She excels in assessing situations, and is also a very bold fighter. As Gosei Pink, she has the Skyic Power of Breath.
Agri/Gosei Black
A hot-blooded Landic warrior and elder brother of Mone who acts cool. He prides himself on being the strongest fighter out of the five Goseigers. As Gosei Black, he has the Landic Power of Stone.
Moune/Gosei Yellow
Aguri's younger sister and youngest member of the group, and as such is very straightforward. As Gosei Yellow, she has the Landic Power of Sprout.
Hyde/Gosei Blue
He is the oldest of the group and the single member of the Seaic Tribe. He serves in keeping the team together. As Gosei Blue, he has the Seaic Power of Surging Waves.
As a group, they work part-time at the Amachi Astronomical Institute for amateur scientist Professor Shuichiro Amachi where they are friends with the Professor's son Nozomu Amachi.

The Universal Annihilation Army Warstar are the antagonists of the series, led by Great King Mons Drake and his top commanders Dereputa of the Meteor and Bladran of the Comet. Warstar's forces are based at the Universal Mothership Indevader and seek to steal the life force of other planets with their Universal Monsters and Demon Bug Soldiers Beebe. Before their invasion of Earth, they realized that the Gosei Angels would be trouble for them, so they took out the Heaven's Tower in a pre-emptive strike.

*Takeru stabs Doukoku with a destruction disk on his sword, but it doesn't work. The Shinkengers get beaten up, and get saved when Hikoma shows up with a spear and beat up the Nanashi about to finish them off.
*Tanba brings them a new disk prepared by Kaoru. Takeru fights Doukoku with dual-wielded Rekka Daizantous, then Mako, Chiaki, Kotoha, and Genta hold Doukoku with Ryunosuke strikes the final blow with the new disk, stabbing hiim in the wound Takeru inflicted earlier.
*Doukoku attains his giant second life, and the Shinkengers (who remain in civilian dress for the rest of the show) call on Samurai Haoh. However, Doukoku easily blasts the mech away, and the Shinkengers begin sacrificing the Origami in order to get close, going from Samurai Haoh to Tenkuu Shinkenoh to Shinkenoh as their cockpit gets increasingly wrecked. Doukoku stabs Shinkenoh through the torso, but the Shinkengers get him with Daishinken Samurai Slash.
*Unwilling to go alone, Doukoku grabs Shinkenoh and both explode in a massive explosion. The Sanzu River and the remains of the Gedoushu return to the underworld, and Shitari sinks with the Rokumon Junk. The Shinkengers survive.
*In the epilogue, all of the other samurai and Kaoru depart, leaving Takeru alone with Hikoma in the mansion. Without translations, I have to say that this seems like a surprisingly lonely final scene!