Clayface I
Nick Name
The Ultimate Clayface
Civilian ID
Basil Karlo



Legal Status
Citizen of the United States with a criminal record.
Nation or Planet of Origin
United States
Group Affiliation

Injustice League

Mud Pack

Secret Society of Super-Villains

Base of Operations
Gotham City
5' 11" - Varies with mass.
180 lbs. - Varies with mass.
Eye Color
Hair Color
Black - Now None
Known Powers

Chemically altered human possessing superhuman strength, speed, agility, stamina, durability with an ability to regenerate body mass, change shape, size, density and kill with a poisonous touch capable of reducing flesh to protoplasm.

Note: Clayface was originally a non-super powered human who used his acting skills and a clay mask to terrorize his victims.


Clayface Mask: Masked used to terrify victims of his crimes.

Note: Clayface no longer uses his mask after gaining superhuman abilities.

Common Enemies

Batman I

Poison Ivy

Robin I

Robin III

Regularly Appearing


Detective Comics

First Appearance
Detective Comics #40 (June, 1940)
Bill Finger& Bob Kane

A once-famous character actor, Basil Karlo became mentally unstable when one of his classic films was being remade. Assuming the role of a grotesque maniac he once played, Karlo murdered those he felt stood in the way of him regaining his stardom.

Committed to Arkham Asylum, he eventually escaped and teamed with others who had assumed the Clayface identity as the Mud Pack. Using genetic material from his criminal teammates, he forced a scientist to develop a serum that gave him the combined powers of his peers making him the ultimate Clayface.