S.P.D. stands for Space Patrol Delta, a fictional organization featured in the Power Rangers franchise. It is responsible for protecting Earth from various extraterrestrial threats. The series, which debuted in 2005, showcases a team of young heroes who transform into Power Rangers to combat villains and maintain peace. The S.P.D. team is equipped with advanced technology and unique abilities, each member representing a different color and role. They work together to thwart the plans of their enemies, including the main antagonist, Emperor Gruumm. The show emphasizes teamwork, friendship, and the importance of standing up against evil.