Exo - Force Exo - Force was a theme inspired by stories from Japanese manga and anime such as " Mobile Suit Gundam " and " Robotech " . The theme and its sets were based around enormous combat mechs known as battle machines piloted by humans against the robots , consisting of the Devastators , Iron Drones and their leader Meca One , who themselves possess combat machinery of their own , with the intent of complete dominance of the mountain they live on , Sentai Mountain . What lay at the bottom of the mountain was never revealed . The theme lasted two and a half years , as it was introduced in spring 2006 and later discontinued in the summer of 2008 . The working title for the series was " Battlepeak " . There was a book series based off of the sets . Story . The story in 2006 is based around the Sentai Fortress , its human inhabitants and the robots that are attacking them . The robots , originally created as mechanical mine workers , had , under the leadership of Meca One , risen against their creators in an attempt to aquire domination over them – the robot rebellion . Humanity was defended by the Exo - Force , a team of the four battle machine pilots Hikaru , Takeshi , Ryo and Ha - Ya - To , their leader being Sensei Keiken , who himself played an important role in the construction of the robots in the first place . At the end of the 2006 story arc , three of the humans , Takeshi , Hikaru , and Ryo , are sent to find the legendary Golden City . Subsequently , Sensei Keiken , Ha - Ya - To , and the other humans travel to the city . At the end of the 2007 story arc , human leader Sensei Keiken is captured by the robots . The team embarks on a mission into the deep jungle at the mountain ' s foot to find him , leaving Hitomi in charge of the Golden City . In the end , their mission is successful , Keiken being rescued from the robots . However , it remains unknown if the robots could be defeated completely , since the series was then discontinued . Legacy . Despite the sets being discontinued , the storyline has developed dedicated followers , who continue the plot through fanfiction on the The Exo - Force Wiki and other websites . Details . Most of the Exo - Force sets consist of large " battle machines " ; these are high - powered , heavily - armoured exo - suits designed to mimic human movement , and are mostly piloted by a single human or robot . Most of these vehicles use Technic joints to give the mech stability with a wide range of movement , and normally come equipped with a short - range melee weapon — a sword , shield or similar — in one hand and a long range weapon such as a pistol or laser cannon in the other . 2006 sets used click ball joints exclusively , while 2007 sets introduced ball joints . Aside from the mecha there were larger combat vehicles , bases , and remote installations such as gates and towers . Also , all of the final sets released in 2008 included a miniature brick - built robot that resembled its respective mech . The human minifigures have a manga - or anime - like appearance , featuring a special eye and hair design . They all have double - side faces . The robots consist of 8 pieces , whereas the legs and the head - torso piece are exclusive to them . They have protruding heads with red eyes ( a red Technic piece being inserted in the back of the head to give the eyes the color ) and are coloured in a metallic tone , being copper ( Iron Drones ) , silver ( Devastator ) or gold ( Meca One ) . The devastators sometimes have a varying secondary ( transparent ) colour in the lower section of their torso , while Meca One has black as a secondary colour . Special features . Power cores : The 2006 sets featured power cores , a light - up brick located somewhere in the mech ' s chasis and connected to one of the weapons by a special fibre - optic cable . This was used to " power up " ( Exo - Force ' s catch - phrase ) the battle machines and the weapons attached to it . All of the 2006 sets included a power core , with the exceptions of a few smaller sets , 7708 Uplink and 7711 Sentry . Exo - Codes : From 2007 on , the power cores were discontinued and " exo - codes " were included in every set . These codes could be typed into LEGO . com to unlock downloads and additional set information . The 2007 codes were printed directly onto 2x1 flat tiles and incorporated into the set build . The 2008 codes were printed on stickers that could be applied to different brick types in different sets .