The Exo-Force storyline for 2006 culminated in the Battle of Sentai Fortress when Meca One unleashed an all-out assault on the humans. Sensei Keiken hurriedly recruited new pilots to man the battle machines and Exo-Force was born. More powerful than ever, their primary aim was this: to completely drive humanity from Sentai Mountain. But before the humans' preparations were complete, the robot legions, armed with battle machines of their own, caught the humans by surprise and quickly seized control of the southern half of the mountain. Some humans, including Sensei Keiken, feared that the robots might come back someday so Sensei Keiken promptly began to construct armored battle machines for defense. The most important bridge they built was the Tenchi (天地 'heaven & earth') Bridge. The humans built bridges to link the two halves of the mountain. The humans eventually overcame the robots, and cast them into the gorge. Fights between the humans and robots broke out, unleashing uncontrollable energies that divided the mountain in two. But one day, a golden robot named Meca One led the robots to revolt against the humans. On Sentai Mountain, there was a peaceful civilization where advanced robots and the ancient way of life went hand in hand.

Lego exo force defender tank