The original stand-alone book "Bill, the Galactic Hero", published in 1965, was followed much later (1989 - 1991) by six sequels:
"Bill, the Galactic Hero On the Planet of Robot Slaves" (1989) by Harry Harrison;
"Bill the Galactic Hero On the Planet of Bottled Brains" (1990), by Robert Sheckley and Harry Harrison;
"Bill the Galactic Hero On the Planet of Tasteless Pleasure" (1991) by David Bischoff and Harry Harrison;
"Bill the Galactic Hero On the Planet of Zombie Vampires" (1991) by Jack C. Haldeman II and Harry Harrison;
"Bill the Galactic Hero On the Planet of Ten Thousand Bars" (1991) by David Bischoff and Harry Harrison (aka "Bill, the Galactic Hero on the Planet of the Hippies from Hell");
"Bill the Galactic Hero: The Final Incoherent Adventure" (1991) by David Harris and Harry Harrison.
