The Tron Theory is proposed for unifying physical science. It presents a new fundamental particle called the tron. The tron is several orders of magnitude smaller than the electron. Trons are premised to be everywhere, their physical involvement thorough. Each tron is composed of even smaller particles called rons. Adjacent trons attract each other with an elemental force that is neutral of charge. The inter-tron force is inversely proportional to the distance between tron cores. The fundamental particles are constructed with trons closely pressed together. Tenuous arrays of trons cohere to form the respective imponderable physical fields. Micro-particle action is revealed as a causal discipline. Particles are presented in determinate activity. The composition and dynamic properties of the tron and ron are set forth in seven axiom forming the Tron Postulate.