 Author Martin Caidin, according to "The Bionic Book" by Herbie Pilato, served as an uncredited consultant for the series throughout its run, and ultimately made a brief appearance in one of its final-season episodes; in addition, author Jay Barbree, who collaborated with Caidin on a number of nonfiction book projects, also wrote a novel based upon the series.During 1976, a spin-off, "The Bionic Woman," was begun, playing also until 1978, or three seasons.During 1987, 1989, and 1994, three made-for-television movies reunited the casts of both series.