A scheme for tokamak formation and sustainment via helicity injection is proposed. The method consists of injecting “source” tokamaks into a “steady” tokamak to sustain its current. The source tokamaks are created using an ohmic heating coil fed from one end and are accelerated toward the steady tokamak by the combined effect of line tension and a mirror field. High efficiency, conservation of toroidal symmetry, and injection of an inductively generated, fairly hot plasma are the relevant features of this method.