Created by Baboo and Squatt with the Monstermatic. Squatt gave Shellshock his name, Baboo was thinking of 'Greta; or 'Peitouche.' His green light made Trini run endlessly and his red light froze Billy, Zack and Kim. It was destroyed by Tyrannosaurus zord. It was also an illusion on the Island of Illusions. "The Trouble with Sheelshock" & "Island of Illusion, Part 1"