The Tron Theory is proposed for unifying physical science. It presents a new fundamental particle called the tron. Trons are much smaller than electrons. Trons are simple spherical-like structures. They are composed of a variable number of smaller particles called rons. Rons have the same structure as trons. Rons are composed of even smaller particles called Ons. The average diameter of a tron depends on the number of rons it contains. Adjacent trons are premised to attract each other with an elemental force that is neutral of charge. This force is inversely proportional to the distance between tron centers. The composition and dynamic properties of the tron and ron are set forth in seven axioms forming the Tron Postulate. The Tron Theory is derived from the Tron Postulate. The Tron Theory claims: There is an ether (herein to be referred to as the tronos). It is composed of tenuous arrays of contiguous trons. The tronos has a variable density that depends on the local electric or gravitational potential. Highly compressed arrays of trons cohere to form the fundamental particles. The phenomena of Quantum Mechanics arise from interaction of the fundamental particles with the tronos in a completely deterministic and causal manner.