7709 Sentai Fortress 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 minifigure s of Sensei Keiken , Takeshi , Hikaru , Ha - Ya - To , Ryo , Meca One , and two Iron Drone s . At 1 , 408 pieces , it was the largest Exo - Force set released . Description . Sentai Fortress : This set consists of twelve main parts . Eight of these ; the gate , the towers , the four walls , and the hangar , make up the fortress . The last four are the four vehicles ; the Silent Strike , the Venom I , the Gate Guardian , and a Venom Walker . The four walls are all similar ; the only differences are the items attached to the top . In the setup shown on the box , the front right wall ( from behind ) has a disk launcher . The front left wall has both a bazooka gun and a missile , and , behind this , in the rear left , there is a transport cart with a seat and a box behind it . The fourth wall has a two - seater passenger cart atop it ( a possible reason for this may be that the tower it connects to contains the medical bay ) . The walls themselves are 13 studs high , and each of them has one small rock piece in the centre . The frame of the gate is built out of six large orange bricks . The gates are hinged , and can open either out or in . Along the gate ' s front , from left to right , there are four symbols attached to it ; Hikaru ' s , Takeshi ' s , Ha - Ya - To ' s , and Ryo ' s , respectively . The gate can be locked , although the lock can be forced with a large vehicle such as the , or the Robot Rammer X1 from 7705 Gate Assault . The two towers are also quite similar . The medical tower has a bed in the centre level . A magnifying glass and a power cord shine a focused red light onto a minifigure seated there . On the top of it , a landing platform for the Gate Guardian , Ha - Ya - To ' s glider , is located . The second features a weapons arsenal , with missiles and guns , located at the same level as the other tower ' s medical centre . The roof of the tower features a control centre , which features two seats , and two large bazookas positioned in it facing outwards . The transparent roof is hinged , and can move up and down . At the front of both of the towers , there are light grey ladders attached to the topmost level , although they do not appear to lead anywhere . At the back of the building is the hangar bay . This mainly consists of two large orange gantries stood upright to form the walls , with a large yellow crane hung between them . Under this , there is a turbo fan such as used in the Fire Vulture and Sonic Phantom , attached to a bar . There are flip - down floors at half of the height of the hangar , both with a rack of tools attached . At the bottom , there is a structure which appears to be a refueling tank . Opposite it is a brick with a large flat area , showing a plan for the Silent Strike battle machine included in the set . There are two revolving pillars at the front of the hangar , showing four different symbols . Battle Machines : The four battle machines included in the set are the Silent Strike , the Venom I , a Venom Walker , and the Gate Guardian . The Silent Strike is very similar to the Stealth Hunter . It has blue wings nearly identical to the Stealth Hunter ' s . Underneath them , a row of missiles runs along both sides . The cockpit piece is the same one that used for the Supernova . For weaponry , it has a large gun and a double - bladed sword , once again similar to those used by the Stealth Hunter . It has large legs , covered in blue armour , with rocket thrusters near the feet . The Venom I is designed very differently , and is built in such a way that the arms only have up - down rotation . It appears to have a large focus on guns and missiles , and not so much on the melee weapons , such as swords , hands , or saws . The set also includes two small vehicles , one , a small glider piloted by Ha - Ya - To , called the Gate Guardian , consiting of a pair of legs and a pair of wings equipped with rockets – wings and legs being connected with each other solely by the pilot minifigure . The other is a small walker known as a Venom Walker , with the body and arms of a silver Devastator , six spider - like legs and a cannon tail . As it is a small walking robot - size creature , it is under debate whether it ' s a Battle Machine or a Robot , as it has the attributes of a Robot , but is almost as large as a small Battle Machine . Minifigures : The minifigures included are Sensei Keiken , Takeshi , Hikaru , Ryo , Ha - Ya - To , Meca One , and two Iron Drone s . All normal minifigures ( that is , humans ) have reversible heads to display two expressions . This is the only set in the first wave that includes all of the regular human minifigures . Sensei Keiken : Sensei Keiken wears white robes and a belt , has long , grey hair and moustache , green eyes , and scar across his face . At the time the set was released , he was exclusive to it , although he later reappeared in the Hybrid Rescue Tank . Takeshi : Takeshi wears red and grey armour , has green eyes and hair , and a scar on his face . Printed on his armour are four stars , and an image of Sentai Mountain . Hikaru : Hikaru has white armour with blue accents , light blue hair , and orange tinting around his eyes , propably some kind of goggles . His armour has the number " . 01 " , and an image of what appears to be wings printed on it . Ryo : Ryo has blue eyes , purple hair and red cloth covering his forehead . He wears an orange pilot suit with grey armor parts and " AT . 01 " written on it . Ha - Ya - To : Ha - Ya - To has green eyes , long eyebrows , and red hair . He wears the exact same armour as Hikaru . Meca One : Meca One looks like a gold devastator , with black markings , particularly around the lower chest . His eyes are not coloured . Both Meca One and the Iron Drones are made of parts used almost exclusively to make them , except for their hands , Meca One ' s arms and the Technic pieces in their heads . Iron Drones : The Iron Drones take the form of copper - coloured , blank - eyed robots . Unlike Meca One , they have no secondary colouring . Background . Sentai Fortress , located at the end of Tenchii Bridge , was the primary base of the humans of Sentai mountain , lead by Sensei Keiken , in their battle against the robot army , lead by Meca One . The set features the robot army attacking the fortress and its defense by the members of Exo - Force .