gun and the protoplasmic substance to defeat Clayface and return him to prison. Matt Hagen eventually breaks out of prison and uses the protoplasmic pool to become Clayface again. This time, Batman defeats Clayface by immersing himself in the protoplasm, with the resulting battle causing Batman to destroy the cave that contained the protoplasmic pool. Clayface later competes with Joker causing Batman, Robin, Batwoman and Bat-Girl to work together to defeat both villains. After escaping from Green Wells Maximum Security Prison upon having stashed some chemicals there, Clayface eventually copies the pool's protoplasmic jelly by chemistry studies, although the artificial protoplasm only allows him five hours of his power compared to the full two days of the pool's. Clayface resumes his crime spree by stealing the priceless stamp collection of millionaire K.A. King and stealing the trophy that was to be given to Batman. Clayface's activities also attract the attention of Superman. Assuming the form of Superman, Clayface is evenly matched with him until Clayface smashes some bleachers to provide a diversion to get away. During Clayface's robbery, Batman used Kryptonite on Clayface's Superman form, only for Clayface to get away by shapeshifting into a rocket. When Batman uses Red Kryptonite on him, it causes Clayface to go crazy. Clayface uses the X-Ray Vision in his Superman form to see who Batman is. Before he can reveal who Batman is, Clayface's powers wear off, causing him to regress back to Matt Hagen. Superman manages to save Clayface from the fall. Matt Hagen had lost the memory of Batman's secret identity as he is handed over to the Gotham City Police Department. When Brainiac returns to Earth to plan his revenge on Superman, he goes on a rampage and blasts the walls to a prison where Matt Hagen was imprisoned. This gives Matt Hagen the opportunity to escape and head to one of his secret laboratories to regain his powers. He makes more of the synthetic formula that gives him his shapeshifting powers for five hours. With Jimmy Olsen by his side, Batman works to track down Clayface while Robin works with Superman to catch Brainiac. This leads to a team-up between Clayface and Brainiac. While Superman and Robin managed to apprehend Brainiac, Clayface tries to escape, only for his formula to wear off which enables Batman and Jimmy Olsen to apprehend him. Clayface later appears as a member of Queen