McCullough wrote the stories for episodes of The Bionic Woman (1976-1977), Eight Is Enough (1977-1978), The Misadventures of Sheriff Lobo (1979), Galactica 1980 (1980), B.J. and the Bear (1979-1981), Falcon Crest (1981-1984, starring Robert Foxworth), Hollywood Wives (1985, with Joanna Cassidy and Mary Crosby), Highlander (1992), Zorro (1990-1993, starring Duncan Regehr and Henry Darrow), Kung Fu: The Legend Continues (1993), Baywatch Nights, JAG (1996), Pacific Blue (1996), and as developer on the action series Soldiers of Fortune, Inc. (1997-1999, starring Mark Sheppard and Melinda Clarke). He also wrote the teleplay for the television drama International Airport (1985), the screenplay and story for the television thriller Dark Mansions (1986), and the television drama Time Out for Dad (