Guts Seijin is a recurring alien antagonist in the classic tokusatsu series Ultraseven. As a member of the Guts alien race, Guts Seijin is known for his cunning intelligence and strategic planning, often posing a formidable threat to Ultraseven and the Ultra Guard. With his distinctive appearance and shape-shifting abilities, Guts Seijin has become one of the series' most memorable villains, orchestrating complex schemes to conquer Earth. His encounters with the protagonist highlight the ongoing battle between humanity and extraterrestrial invaders.