Dr. Thomas "Tommy" Oliver is a Power Ranger veteran and considered a legend among the Ranger community. He is often considered to be the greatest Power Ranger of all time, having been part of four Power Ranger teams over the years. Originally used for evil purposes by Rita Repulsa, Tommy quickly turned good and helped the Rangers in defeating the forces of darkness. In doing so, not only did Tommy prove himself to be a worthy ally, but he became exactly the kind of leader the Rangers needed and was therefore promoted, taking command from the original leader, Jason. Tommy had gone through a number of power variations through the years. Originally the first Green Ranger, those powers ran dry and he became the White Ranger, the White Ninja Ranger, the Red Zeo Ranger, and the first Red Turbo Ranger. He is later the husband of Katherine Hillard in a possible future, the canonicity of which is debatable.