It was developed for the Arcade and ported to the PC Engine. It also saw an enhanced port for the Sega Genesis named Heavy Unit: Mega Drive Special. In the far-flung future of 2013, the player's first artificial sun Le Tau is under attack from strange genetically-modified lifeforms and Earth must send in a powerful enough ship to combat them.The player controls a jet fighter that can transform into a mecha if the right power-up is collected. They can also find other power-ups which increase their firepower.CharactersMCR-X09 'Heavy Unit' - the main character's ship, a slightly transformable giant robot.Death Blinger - Scene 1 boss, and unfortunate victim of Japanese to English translation.Flap Bone - Scene 2 boss.Float Fortress - Scene 3 boss.Hard Shell II - Scene 4 boss.MVR-000 - Scene 5 boss.GameplayScrolling from left to right, the player must navigate each level by destroying enemies and avoiding level hazards. In the course of the game, the player can collect a number of power-ups - Speed Up, Power Booster, Shield Unit, Transformer, and Extend Player.