On June 16, 1979, "Son of Svengoolie" debuted on WFLD, with Koz in the title role. The show also aired on Field Communications-controlled stations in Philadelphia, Boston, San Francisco, and Detroit. The series ran until WFLD, then owned by Metromedia, was sold to Rupert Murdoch's Fox Television Stations Group in 1986 as part of the newly created Fox network. New management canceled the show, deciding that it did not fit the new programming direction. After 334 shows, the final episode aired January 25, 1986. Koz returned to WFLD in various capacities, mainly as the host of "Fox Kids Club" and "The Koz Zone" weekday afternoon children's programming, and appearing as an announcer on the Fox network's 1988 New Year's Eve broadcast.