This is not a gun for hanging over the fireplace or sticking in the umbrella stand, it is a gun for going out and making people miserable with.
—The Guide[src]

The Kill-o-Zap is a blaster gun weapon which was wielded by the police from Blagulon Kappa when they came to Magrathea to arrest Zaphod. It was first mentioned in the novel The Hitchhiker's Guide to the Galaxy and subsequently referenced throughout the series in the role of a standard and widespread brand of raygun.

In the third book, Life, the Universe and Everything, the group armed themselves with Kill-o-Zap guns against the Krikkiters. Arthur Dent struggled to use the gun; he "fumbled to release the safety catch and engage the extreme danger catch as Ford had shown him."


In the second novel, The Restaurant at the End of the Universe, it is said that the designer of the gun "had clearly not been instructed to beat about the bush." It was said that he'd been told to "make it evil," to make it clear that the gun had "a right end and a wrong end," and to make it obvious to anyone at the "wrong" end that "things are going badly for them." It was said that if it was necessary to attach spikes, prongs, and "blackened bits" all over the gun, then: "so be it."

In the 2005 movie adaptation, the gun had a sophisticated look. It looked like a white sphere that covered the hand and had a trigger on the inside. This version was wielded by Marvin.


Presumably, the name is meant to evoke the 'overkill' of the destructive potential of the weapon, as well as parodying the general SF tendencies in naming guns. Also, it could likely be a play on kilowatt, kilovolt et cetera.