The Scub Coral originally crashed into the Earth's atmosphere sometime in the 21st century. They survived a collision with an artificial satellite (named Eureka) and landed in the Pacific Ocean, however their condition was critical, so the beings fused with normal ocean coral to borrow their physical body. Possessing a powerful metabolism, the Scub Coral are capable of growing into an enormous size in the blink of an eye, and shortly after their arrival, the planet's atmosphere had been contaminated with Trapar, a particulate matter released from the Scub Coral's biological activities.