Detective Comics 1937 #607 Direct ed. - back issue - $3.00

Looker rescues Batman, while Karlo forces Doctor Lowell to combine the blood samples that he stole from Payne and Fuller and uses the mixture on himself to become the ultimate Clayface. Meanwhile, Payne and Fuller escape and find that they have feelings for each other.

• The Mud Pack, Part Four: The China Clay Syndrome - By injecting himself with a mixture of blood from Payne and Fuller, Basil Karlo gains the shape-changing powers of Clayface 4 with the burning touch of Clayface 3.
• - poster
• - Letters from Leif Vanderwall, Charles D. Brown, Kevin P. Lenahan, Erick M. Mahr and Jeff Klemens. Also 1/2 page From the Den by Denny O'Neil.