It took Harry Harrison nearly 40 years to write a sequel to his underrated anti-war satirical novel, "Bill the Galactic Hero", and, while it's not nearly as clever, scathing, and apropos as the original, "Bill the Galactic Hero: The Planet of the Robot Slaves" is still humorous and entertaining.
Published in 1989, "Bill Part 2" (as I will henceforth refer to it, even though it is inexplicably numbered "Volume 1" on the cover, which doesn't make sense as the first "Bill" book was actually published in 1965, although I'm guessing that Harrison was basically trying to distance himself from the original book due to the sharp contrast in theme and political commentary, of which there is really little to none in this sequel, in an attempt to recreate the series---the contemporary term would be "reboot"---as a light, comedic sci-fi parody, which ultimately succeeds, and which continued in six more sequels) basically carries on where the first book left off.
"Bill Part 2" is silly-dumb. It's closer in spirit to the goofiness of Mad magazine and Heavy Metal comic books than it is to the social commentary of the original, which is fine by me, as I grew up reading both magazines. It helps to be a sci-fi geek when reading this, as it abounds with a ridiculous amount of sci-fi in-jokes and references. Everything from cyberpunk, Anne McCaffrey's "Pern" series, Edgar Rice Burrough's "John Carter of Mars" series, and Arthurian legends are lampooned here, and there are probably a half-dozen more references I missed.
Needless to say, there's not much plot of which to speak. It's just Bill and a group of rag-tag characters thrown together jumping from one ridiculously silly situation to another, with a plethora of bad puns, knee-slappers, and groaners along the way. There's even some occasional T&A, but it's mostly PG-13 rated, so don't expect it.
All in all, "Bill 2" was good, clean fun. Utterly pointless, but nonetheless entertaining. I have already been searching Amazon for the other six books in the series.