Paul Cassidy was the first in a line of ghost artists on the strip and took over the inking and detail work in 1939. In September 1940, Leo Nowak replaced Cassidy on the strip. Other assistants during this time included Dennis Neville, John Sikela (beginning in 1940), Ed Dobrotka (beginning in 1941), Paul J. Lauretta, and Jack Burnley (beginning in 1941).
Paul Cassidy was the initial ghost artist in the strip, taking over ink work and detail in 1939. In September 1940, Leo Nowak took over from Cassidy on the strip. Other assistants during this period included Dennis Neville, John Sikela (starting in 1940), Ed Dobrotka (beginning in 1941), Paul J. Lauretta, and Jack Burnley (starting in 1941).