Dennis the Menace : Mr. George Wilson Original Animation Production Cel (1986). The series originally aired nearly 40 years ago on 9/22/1986 and is based off the comic strip of the same name by Hank Ketcham (1920-2001). Henry King "Hank" Ketcham is an American cartoonist that received the Rueben Award for his Dennis the Menace comic strip for which he wrote and drew from 1951 to 1994. The troublemaker Dennis was voiced by Brennan Thicke whose only other notable work being the classic '80s cartoon MASK (1985). Here we have a magnificent hand-painted cel in excellent condition (see photos) featuring the character Mr. George Wilson. Size : 26 x 23 cm