In Scientology, Operating Thetan (OT) is a state of complete spiritual freedom in which one is a "willing and knowing cause over life, thought, matter, energy, space and time". The Church of Scientology offers eight "levels" of OT, each level costing thousands of US dollars. The OT levels are confidential and not revealed to Scientologists until they reach the third Operating Thetan level. In practice, the objective of these levels is to remove "body thetans" which are "confused, disembodied souls from other planets who have attached themselves to us".

Scientology is a set of beliefs and practices invented by the American author L. Ron Hubbard, and an associated movement. It is variously defined as a cult, a business, a religion, a scam, or a new religious movement. Hubbard initially developed a set of ideas that he called Dianetics, which he represented as a form of therapy. An organization that he established in 1950 to promote it went bankrupt, and Hubbard lost the rights to his book Dianetics in 1952. He then recharacterized his ideas as a religion, likely for tax purposes, and renamed them Scientology. By 1954, he had regained the rights to Dianetics and founded the Church of Scientology, which remains the largest organization promoting Scientology. There are practitioners independent of the Church, in what is referred to as the Free Zone. Estimates put the number of Scientologists at under 40,000 worldwide.