2010

2010 was the tenth year of BIONICLE, and the last year of the set-line.

Story
The story of 2010 started on Bara Magna when Mata Nui returned from the Valley of the Maze. With him, he brought an object of incredible power, the original power source of a failed experiment of the Great Beings. Mata Nui eventually took control over the giant robot. However, Teridax, now in control of the Matoran Universe, soon landed on the planet, and the two beings were soon locked in combat. The Glatorian Gresh, now controlling the power of Air, discovered a hatch in Teridax's robot. On the other side of the hatch, an army of Rahkshi was about to enter the surface of Bara Magna. Gresh noticed them, and hid. When the Rahkshi had passed, Gresh noticed a being wearing white armor, who was just about to leave the robot. He quickly attacked the newcomer, who revealed himself to be a Toa of Light. In the meantime, the Rahkshi attacked the other Glatorian of Bara Magna.

Takanuva and Gresh lead the other beings inside Makuta Teridax out, including Tahu Nuva. An all-out battle began below, the Skakdi army, recently created by Nektann, and the Rahkshi aided by the Skrall from Bara Magna fought Gresh, Tahu and Takanuva over the Golden Armor enhanced by the Mask of Life, and created by the Great Beings for Tahu. Mata Nui used the prototype robot body to fight Teridax, and he finally realized his forgotten mission: to unite the three worlds of Bara Magna, Bota Magna, and Aqua Magna into Spherus Magna, the original "paridise" that Mata Nui and all the creations of the Great Beings came from.

Official Description
Below is the official description from Lego.com:

Showdown In The Sky

Mata Nui has been busy since defeating the Skrall leader Tuma and helping Glatorian and Agori unite on Bara Magna. His quest to free his people, enslaved by the evil Makuta, continues as he journeys to the north. There, he finds an ancient fortress of the Great Beings, his creators. Inside, Mata Nui discovers a source of power so great that it could bring the smaller robot found on Bara Magna back to life.

Mata Nui convinces Raanu, the leader of the Agori, to allow him to use the Bara Magna robot to save his people and fulfill his destiny. Reluctantly, the Agori leave their new mega-village and watch Mata Nui repair and raise the robot that was their home for a short while. Just in time – far-off Makuta, sensing the new threat, leaves the ocean planet and brings his huge robot form to Bara Magna in order to crush Mata Nui for good.

Two massive robots – one containing thousands of Matoran and Toa – face off above the clouds, while villagers and warriors scurry below. New threats face the Glatorian and Agori: hordes of yellow Rahkshi, Piraka warriors, and remnants of the Skrall attack.

Meanwhile, inside the giant Makuta robot, Toa Tahu and his friend Takanuva, Toa of Light, manage to escape and contact Glatorian Gresh on the surface of Bara Magna. They try to help fight the merciless warriors that Makuta has unleashed, but they are vastly outnumbered. The Mask of Life, aiding Mata Nui in the fight against Makuta, helps Tahu by transforming him to his original form so he can don powerful armor that will stop the Rahkshi in their tracks. But before Tahu can gather all six pieces, some are stolen!

Battle rages above and below. Tahu and his friends desperately search for the golden armor that can turn the tide in the ground conflict. Towering high above, Mata Nui struggles with his smaller robot body against the much bigger and more powerful robot, controlled by Makuta. His ultimate destiny can only be fulfilled after defeating Makuta – but does he have the strength to defeat his enemy as well as heal a planet?