Dash Roberts is a former elite police officer in the Metropolitan Police who after an event that traumatized one of his colleagues has been "demoted" into the Special Investigations Division, a group that looks into the stranger happenings in the city, particularly the "Heavy Acceleration" events that leave people unable to move that the public have termed the "Slowdown." When he is chosen by the Shift Driver and Tridoron, Dash transforms into Kamen Rider Shift and is tasked with battling the Roidmudes who wish to take over the world by eliminating humanity.