The character Walter Skinner was played by actor Mitch Pileggi, who had unsuccessfully auditioned for the roles of two or three other characters on "The X-Files" before getting the part. At first, the fact that he was asked back to audition for the recurring role slightly puzzled him, until he discovered the reason he had not previously been cast in those roles—Carter had been unable to envision Pileggi as any of those characters, because the actor had been shaving his head. When Pileggi auditioned for Walter Skinner, he had been in a grumpy mood and had allowed his small amount of hair to grow. His attitude fit well with Skinner's character, causing Carter to assume that the actor was only pretending to be grumpy. Pileggi later realized he had been lucky that he had not been cast in one of the earlier roles, as he believed he would have appeared in only a single episode and would have missed the opportunity to play the recurring role.