When a mining colony on an endangered moon is threatened, it’s a race against time for the Enterprise crew to find a solution in this original novel set in the universe of Star Trek: The Original Series. The USS Enterprise responds to a distress call from a vital dilithium-mining colony in the Klondike system. The colony is located on Skagway, a moon orbiting Klondike-6, a gas giant not unlike Saturn. For unknown reasons, the planet’s rings are coming apart, threatening the colony and its inhabitants. Kirk and his crew need to find a solution—fast.There are more than 3,000 colonists, including hundreds of families, on Skagway, which is more than even the Enterprise can take on, and there are no other rescue ships or habitable planets anywhere in the vicinity. Meanwhile, an approaching comet that may be the source of the crisis turns out to be a mysterious alien probe. Sensors indicate that the probe is incredibly old and running low on power. Suspecting that the probe may have something to do with the threat to Skagway, Kirk has the probe beamed aboard the Enterprise. Suddenly after a blinding flash, Kirk suddenly finds himself floating in orbit above Saturn in our solar system, drifting in space wearing a twenty-first century NASA spacesuit. What just happened?

Colonel Shaun Christopher, commanding the first manned mission to Saturn in 2020, and Captain Kirk, sent to stop a planet's rings from falling apart, try to cope with their new situations after they switch places.

The Ephrata Institute is an intellectual think tank at the outer fringes of the final frontier. Dedicated to the arts and sciences, the Institute seems an unlikely target for an invasion, but it proves easy pickings when the Crusade comes from beyond, determined to impose its harsh, unbending Truth on all the worlds of the Federation. Armed with weaponized gravity, the alien Crusaders will stop at nothing to rescue the universe from its myriad beliefs . . . even if it means warping the mind and soul of every sentient being they encounter. Responding to an urgent distress signal, Captain James T. Kirk and the crew of the U.S.S. Enterprise soon find themselves in conflict with the Crusade, and facing individual challenges. When Kirk and Spock are transported to the Crusade’s distant homeland to confront the source of the invasion, Sulu finds himself trapped behind enemy lines, while Lieutenant Uhura is faced with possibly the most difficult decisions of her career. As the Crusade sets its sights beyond Ephrata IV, it is up to the Enterprise and its besieged crew to keep freedom of thought from being crushed beneath the weight of worlds!

An epic new Star Trek saga by New York Times bestselling author Greg Cox set during the original five-year mission! The planet Vok is holding its first free elections after years of oppressive military rule. Captain James T. Kirk and the crew of the Starship Enterprise have been dispatched by Starfleet to serve as impartial observers, but remaining neutral proves a challenge, as Kirk confronts a tangled web of scandal, conspiracy, and assassination plots—with the stability of an entire sector at stake. To make matters worse, Dr. Leonard McCoy has vanished while on a mission of mercy to Braco, a nearby planet only a system away. With Kirk unable to abandon his vital mission on Vok to hunt for his friend, it’s up to First Officer Spock and Christine Chapel to lead a team in search of the missing doctor, even if it means risking whatever fate befell McCoy. Unknown to his friends and crewmates, however, McCoy has been spirited away to another world, Ozalor, where he’s expected to find a cure for a mysterious ailment plaguing a member of the planet’s ruling family. Torn between his Hippocratic oath and his desire to escape, McCoy finds himself at the center of deadly palace intrigues—and a struggle for power that may ultimately consume all three worlds!

When a mysterious assassination threatens the peace process the U.S.S Enterprise is overseeing in a distant solar system, Captain James T. Kirk suspects Lenore Karidian, who tried to kill him twenty years earlier.

A Star Trek adventure set during The Original Series era and featuring James T. Kirk and the U.S.S. Enterprise crew! While testing a new shielding device, the U.S.S. EnterpriseTM is caught in the middle of a Klingon/Romulan battle. The Enterprise crew rescues a lifepod, and they are confronted by a Klingon who claims to know nothing of human existence. Convinced the Klingon is telling the truth, Captain Kirk hurries to Starfleet Headquarters in search of answers. But upon arriving on Earth, the Starship Enterprise crew finds that Earth is a vast jungle-like paradise where large, reptillian animals rule, with no signs of human life anywhere. Kirk must travel to the past in search of the key to the mystery, or face the destruction of the human race.

An original novel set in the universe of Star Trek: The Original Series that reveals long-held secrets about Captain Kirk's past for the first time! STARDATE 6122.5. A diplomatic mission to the planet Yusub erupts in violence when ruthless Orion raiders attempt to disrupt the crucial negotiations by force. Caught in the midst of a tense and dangerous situation, Captain James T. Kirk of the U.S.S. Enterprise finds an unexpected ally in the form of an enigmatic stranger who calls herself “Annika Seven.” STARDATE 53786.1. Seven of Nine is taking part in an archae­ological expedition on an obscure planetoid in the Delta Quadrant when a disastrous turn of events puts Voyager’s away team in jeopardy—and transports Seven across time and space to Yusub, where she comes face-to-face with one of Starfleet’s greatest legends. STARDATE 6122.5. Kirk knows better than most the danger that even a single castaway from the future can pose to the time line, so he and Seven embark on a hazardous quest to return her to her own era. But there are others who crave the knowledge Seven possesses, and they will stop at noth­ing to obtain it—even if this means seizing control of the Enterprise!