Besides Hogan's Heroes, he appeared as a guest star in such television shows as Navy Log, Mike Hammer, M Squad, Ben Casey, The Virginian and Perry Mason. Allyn also did some directing, producing several episodes of the television series, Payton Place. Then in 1971, he moved to television movies when he produced The Last Child. In 1981 he produced Rich and Famous, his first theatrical film. On January 3, 1999, Allyn died from complications caused by heart disease.