A yet undiscovered ultra-heavy, negatively charged particle X−, a remnant from the early Universe, could be the origin of diverse cold fusion phenomena. The possibility that the random fusion neutrons reported by Jones et al. in association with electrolysis of heavy water may be caused by inflight X−-induced reactions is considered in detail. The catalysis of other cold fusion phenomena such as heat production without penetrating radiation, or tritium production without production of neutrons, is also discussed.