The leader of the 31 Machine Primevals, and presumably the most powerful. Created Pasder and Pagliaccio to act as independent "Terminal Programs" - it appears that these two are actually the two halves of Heart itself. As the voice of the Z-Master, Heart spoke using a dual-layered voice consisting of Pasder and Paglaccio's voices in sync - however, once GGG and King J-Der had entered the interior of the Z-Master and fought their way to Heart itself, it instead spoke in a psychotically calm male voice. Destroyed by an explosive release of The Power within the Primeval by King J-Der.