American | American Civil War | American Broadcasting Company | American football | African American | American Idol | American Revolutionary War | American Revolution | American Association for the Advancement of Science | American Red Cross | American Library Association | American Museum of Natural History | American Express | American Academy of Arts and Sciences | American League | American Association | American Heart Association | American comic book | American Institute of Architects | American Airlines | American Hockey League | Spanish-American War | Pan American Games | American Cancer Society | Whitney Museum of American Art | American Ballet Theatre | American Legion | American University | Union (American Civil War) | Scientific American |
He also guest starred on many television series during his career, including appearances on Mod Squad, Alias Smith and Jones, Mission: Impossible, Hawaii Five-O, Gunsmoke, The Greatest American Hero, Soap, The Fresh Prince of Bel-Air, The X-Files, Murder, She Wrote and Hill Street Blues.
Other guest appearances include Mission: Impossible (as Ernst Graff in "The Legacy") Voyagers!, The Dukes of Hazzard, The A-Team, Babylon 5 (as "Knight One" in "And the Sky Full of Stars", 1994), Charmed (as "Necron" in episodes "A Witches Tale" 1 & 2) and The X-Files and The Greatest American Hero (as Dack Hampton in the episode "Rock 'n' Roll").
In 1982, due to the success of the first season of The Greatest American Hero, Katt signed to MCA and released an album, Secret Smiles under the name Billy Katt.