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Planet X

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Let X Be Excitement (1969), by Christie Harris.

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Dangerous Mr. X (1929), by Francis Duncan.

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A collector’s guide!

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People Minus X (1958), by Raymond Z. Gallun.

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The Face of X (1960), by Lionel Roberts.

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Virus X (1945), by Sydney Horler.

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Commando X (1967), by Poke Runyon.

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The Man from Planet X No. 2: Tiger by the Tail (1975), by Hunter Adams.

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The Power of X (1968), by Arthur Sellings.

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Planetary Agent X (1965), by Mack Reynolds.

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

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

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Echo X (1962), by Ben Barzman.

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

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Utopia Minus X (1966), by Rex Gordon

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Warrant for X (1945), by Philip MacDonald.

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The X Factor (1965), by Andre Norton.

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

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The Big X (1959), by Hank Searls.

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

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Venus Plus X (1960), by Theodore Sturgeon.

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

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Tomorrow Plus X (1957 edition), by Wilson Tucker.