7709 Sentai Fortress is an Exo-Force set released in 2006. It consists of a large fortress, two robot battle vehicles and two human battle vehicles. Included are the minifigures of Sensei Keiken, Takeshi, Hikaru, Ha-Ya-To, Ryo, Meca One, and two Iron Drones. At 1,408 pieces, it was the largest Exo-Force set released.