From 1959 to 1962, Karns was cast as Admiral Walter Shafer in seventy-three of the ninety-five episodes of the CBS military sitcom/drama series, Hennessey, starring Jackie Cooper in the title role of a United States Navy physician, and Abby Dalton as nurse Martha Hale.
Roscoe Conkling | Roscoe Arbuckle | William Roscoe | Roscoe Orman | Roscoe Pound | Ingrid Roscoe | Karns | Thomas Roscoe | Roscoe Shelton | Roscoe "Fatty" Arbuckle | Roscoe Beck | Karns, Pennsylvania | William Roscoe Estep | Virginia Karns | Roscoe Turner | Roscoe Tanner | Roscoe, Missouri | Roscoe Lee Browne | Roscoe Karns | Roscoe, Illinois | Roscoe H. Hillenkoetter | Roscoe Drummond | Roscoe Bartlett | Roscoe | Ingrid Roscoe, Inspecting the 3rd Battalion (Duke of Wellington's) of the Yorkshire Regiment | Henry Enfield Roscoe | Charles Roscoe Savage |
Todd Karns was the son of Mary Fraso and character actor Roscoe Karns.