Emperor Gruumm is a fictional character from the Power Rangers franchise, specifically appearing in the series Power Rangers S.P.D.. He is the main antagonist and is known for his ambition to conquer Earth and other planets. Gruumm is a powerful alien warlord with a distinctive appearance, featuring a blue and silver armor that enhances his strength and abilities. Gruumm commands an army of villains, including his loyal henchmen, and often devises elaborate plans to defeat the S.P.D. Rangers. His character embodies themes of power and ambition, making him a formidable foe throughout the series.