Aneutronic energy (fusion with little or negligible neutron flux) requires plasma pressures and stable confinement times larger than can be delivered by current approaches. If plasma pressures appropriate to burn times on the order of milliseconds could be achieved in aneutronic fuels, then high power densities and very compact, relatively clean burning engines for space and other special applications would be at hand. The PLASMAK™ innovation will make this possible; its unique pressure efficient structure, exceptional stability, fluid-mechanically compressible Mantle and direct inductive MHD electric power conversion advantages are described. Peak burn densities of tens of megawatts per cc give it compactness even in the multi-gigawatt electric output size. Engineering advantages indicate a rapid development schedule at very modest cost.