The "Harold Shea" Stories is a name given to a series of five science fantasy stories by the collaborative team of L. Sprague de Camp and Fletcher Pratt and to its later continuation by de Camp alone, Christopher Stasheff, Holly Lisle, John Maddox Roberts, Roland J. Green, Frieda A. Murray, Tom Wham, and Lawrence Watt-Evans. De Camp and Stasheff collectively oversaw the continuations. The series is also known as the "Enchanter" series, the "Incomplete Enchanter" series (after the first collection of stories) or the "Compleat Enchanter" series.
In the original stories, psychologist Harold Shea and his colleagues Reed Chalmers, Walter Bayard, and Vaclav Polacek (Votsy) travel to various parallel worlds where ancient myths and legends are reality. In the course of their travels, other characters are added to the main cast, notably Belphebe and Florimel, who become the wives of Shea and Chalmers, respectively, and Pete Brodsky, a policeman who is accidentally swept up into the chaos. In the later continuations, the most notable additions to the cast are the recurring villain Malambroso and Voglinda, the young daughter of Shea and Belphebe.
The protagonists utilize a system of symbolic logic to project themselves into the worlds they visit, but it is an inexact science, and they miss their target realities as often as they hit them. For example, in the first story, "The Roaring Trumpet", Shea intends to visit the world of Irish Mythology, and instead ends up in Norse mythology. Most of the worlds visited have systems of physics different from ours, usually magical, which the heroes devote a considerable amount of effort to learning and applying. Much humor is drawn both from the culture shock of their encounters and from the reality that they usually do not understand the local systems well enough to be able to predict the actual effects of the spells they attempt.