The Time Masters
From outer space... Hurtled to Earth ten thousand years ago... two timeless beings become enmeshed in a weird and frightening twentieth century conflict...
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Wilson Tucker
Arthur Wilson "Bob" Tucker (1914–2006) was an American mystery, action adventure, and science fiction writer, who wrote professionally as Wilson Tucker.
He was also a prominent member of science fiction fandom, who wrote extensively for fanzines under the name Bob Tucker, a family nickname bestowed in childhood (his pronunciation corruption as a child of the actual nickname "Bub"). He became a prominent analyst and critic of the field, as well as the coiner of such terms as "space opera".
The Time Masters
The Time Masters consists of two books. The current recommended reading order for the series is provided below.

