The next day, Julie Madison is scheduled to film her own scene with "the Terror" and Clayface lurks in the shadows.  At the scene's critical moment, he aims a knife but his hand os stayed by a bat-rope wrapping around his wrist.    A melee ensures with Clayface swearing he will never be taken alive.  He is proven wrong when the combined efforts of Batman and Robin truss him up for the authorities and when the make-up is removed, Clayface stands revealed as Basil Karlo.   Driven mad from jealousy and rage at his lost career, he had determined that no one would replace him and when Walker had discovered his identity, he had also been murdered.  Karlo is then remanded to the a prison asylum while he case was decided (Detective Comics #40).

Nearly a year later, Karlo is being transferred between prison during a violent storm when the ambulance taking him skids off the road and over a steep embankment, killing the drivers.  Karlo survives, more insane that ever and vows to take his vengeance as Clayface!  Finding a movie supply story, he assaults the owner and takes what he needs from their inventory - make-up, wigs and costuming  - to re-create his identity as Clayface.  

Reading about it in the papers the following day., Batman and Robin suspect Clayface will attempt to avenge himself on Argus studios and that evening, they patrol the largely empty studio.  Clayface, lurking in the shadows, sees them and resolves to take his revenge on them as well.  He first attacks Batman with a spear, which the detective dodges.  The two engage in hand-to-hand combat, which ends when Clayface dazes Batman with a prop.  He then leaves Batman on the floor and places a truck in gear, heading for him.  Expecting Batman to die, crushed beneath the truck's wheels, he sets off in search of Robin.

Clayface funds the Boy Wonder and clubs him from behind.  He leaves the unconscious teen on a set and then sets the entire studio ablaze.  Fleeing, he does not see Batman dodge the truck and arrive at the fire.  Learning Robin is still inside, Batman douses himself with water and charges into the blaze.  Finding Robin, he navigates back to safety but Clayface is long gone.  That evening, as Julie Madison - now known as Portia Storm - is driving home, she spies a skulking figure that she is certain is Clayface following her.

The next day, Batman pays the studio a visit on the set of Storme's new movie.  Agreeing that Clayface will likely target her for thwarting his prior search for vengeance, they arrange a plan to lure him into the open.  Later that day, Batman and Robin crash through the studio's guard as Clayface watches from hiding.  As Portia's scene reaches a key moment, Clayface uses a bow to lodge an arrow in her back.  Seeing where the arrow came from, Batman gives chase and corners Clayface.  The two battle down a flight of stairs and the mad criminal is eventually subdued and taken into custody.  As the actors rush to the fallen Portia, it is revealed that "Robin" is actually Portia Storme in a spare uniform and "Portia" is Robin wearing a life preserver of cotton and cork which has absorbed the arrow's impact (Detective Comics #49)

The later activities of Clayface are unrecorded.  During the Infinite Crisis, Power Girl view fragments of time from Earth-Two, on which shows the adult Robin pursuing Clayface.  When this occurs is unclear but is presumably at least the 1970's and it is not clear if this is Basil Karlo or an unidentified imitator or successor. The final fate of Basil Karlo on Earth-Two remains unknown.