1. Bill the Galactic Hero (1965) by Harry Harrison
2. The Planet of Robot Slaves (1989) by Harry Harrison
3. The Planet of the Bottled Brains (1990) by Harry Harrison and Robert Sheckley
4. The Planet of Tasteless Pleasure (1990) by David Bischoff and Harry Harrison
5. The Planet of the Zombie Vampires (1991) by Jack C Haldeman, II and Harry Harrison
6. The Planet of the Hippies from Hell (1991) by David Bischoff and Harry Harrison
     aka The Planet of Ten Thousand Bars
7. The Final Incoherent Adventure (1992) by David Harris and Harry Harrison