"Earth's Defender: Regenerator" follows the story of Mark Johnson, a high school student with the extraordinary power to regrow limbs and parts his body. By night, he takes on the identity of Regenerator, a superhero who tirelessly works to protect his fellow citizens and Earth from various threats. However, when Mark discovers the truth about his father's origins and his connection to a powerful alien race, it propels him on a journey of self-discovery and courageously defending both Earth and his mysterious heritage.