Also known as a magnetic fusion drive, or a mega-ion drive.
A staple of high end sci-fi is the replicator or the nano-assembler. There is a much more practical and less technomagical way to achieve the same goal. The exciting thing is that this technology exists now, and we're getting much better at it.
Maybe in the future, you can earn money by allowing yourself to be possessed by the genius loci of Taco Bell. And then it just spews ads out of your mouth during all the times you aren't using it.