Ploid Saga

Three games in the Ploid universe. V.O.I.D.+: an alien race invades Earth, destroying everything in its path. Ploid heroes Alpha and Omega travel through time — feudal Japan, the Ice Age, the medieval era and beyond — to collect sacred stones before the invaders do, as time itself begins to collapse. PLOID: a sequel where the Ploids have formed a time-and-space patrol to prevent another crisis. Alpha and Omega evolve into PLOID X through time travel, gaining temporary combat upgrades, and must visit 7 sacred ruins to collect disk files needed for their final evolution. UCHUSEN 2: three high-tech mobile war suits take on the alien invasion Uchūsen in a shoot-em-up, with the goal of breaking through to the enemy base and ending the intergalactic war.