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The universe has less than a century left... unless Spock can change history.

The Enterprise is summoned to transport a dangerous criminal from starbase prison to a rehabilitation center: brilliant physicist, Dr. Georges Mordreaux, accused of promising to send people back in time - then killing them instead. But when Mordreaux escapes, bursts onto the bridge and kills Captain Kirk, Spock must journey back in time to avert disaster - before it occurs.

Now there's more at stake than just Kirk's life. Mordreaux's experiments have thrown the entire universe into a deadly time warp. Spock is fighting time... and the universe is closing in on itself with the relentless squeeze of the Entropy Effect.

Callahan's Place is the neighborhood tavern to all of time and space, where the regulard are anything but. Pull up a chair. grab a glass of your favorite, and listen to the stories spun by time travelers, cybernetic aliens, telepaths... and a bunch of regular folks on a mission to save the world, one customer at a time.

Martin Padway, 20th-century archaeologist, becomes a reluctant one-way time-traveller, landing in Rome on the verge of the Dark Ages. With no way home, he sets out to make the world he's in a better place.

In short order, Padway "invents" and introduces such things as Printing and newspapers, Arabic numerals, Double entry bookkeeping, Copernican astronomy, and, most important -- Distilling. And the world of decaying Rome will never be the same!

Contains two short stories in the Legion Universe: The Legion of Time and Aftwer World's End.

The hope of a future utopia hangs literally on a thread of probability. Instead, armageddon lies almost certainly in the future of humanity. Only the Legion of Time can alter the future course of history. Only Denny Lanning can decisively help them. But to do so, he must first die--for the Legion is composed of dead men--and second, he must kill one of the two women that he loves. . .

After World's End, a short novel, is another saga of time-adventure, also included in this volume. An American astronaut helplessly orbits the solar system as millennia pass. And on Earth, humanity's bright future is destoryed by war with an enemy they themselves created.