A bizarre cosmic phenomenon allows a Klingon ship to travel into the past. Its aim is to change the course of history - and destroy the Federation.

Ishmael 1991, Star Trek, New York, NY

ISBN-13: 9780671743550

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Ishmael 1990, Pocket Books

ISBN-13: 9780671735876

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Ishmael 1989, Titan Books Ltd, London

ISBN-13: 9781852861834

New edition

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Ishmael 1988, Pocket Books

ISBN-13: 9780671660895

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Ishmael 1985, Pocket Books

ISBN-13: 9780671554279

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Ishmael 1985, Turtleback Books, New York, NY

ISBN-13: 9780785747116

Turtleback School & Library edition

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