By: Joshua Glenn

Planetary Agent X (1965), by Mack Reynolds.

By: Joshua Glenn

Madame X (1966), adapted by Michael Avallone from the 1966 movie.

By: Joshua Glenn

Nurse Lily and Mister X (1961), by Diane Frazer.

By: Joshua Glenn

Echo X (1962), by Ben Barzman.

By: Joshua Glenn

Perry Rhodan No. 16: Secret Barrier X (1972), by W.W. Shols.

By: Joshua Glenn

Utopia Minus X (1966), by Rex Gordon

By: Joshua Glenn

Warrant for X (1945), by Philip MacDonald.

By: Joshua Glenn

The X Factor (1965), by Andre Norton.

By: Joshua Glenn

The Tragedy of X (1941), by Ellery Queen.

By: Joshua Glenn

Fritz Leiber’s SF satire The Silver Eggheads first appeared in The Magazine of Fantasy & Science Fiction in 1959. In it, he imagined a future world in which books — cranked out at the rate […]

By: Joshua Glenn

The Big X (1959), by Hank Searls.

By: Joshua Glenn

The Game of X (1965), by Robert Sheckley.

By: Joshua Glenn

How they smoked during the Radium Age.

By: Joshua Glenn

Venus Plus X (1960), by Theodore Sturgeon.

By: Joshua Glenn

X (1963), adapted by Eunice Sudak from the 1963 movie X.