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First published September 30, 1991
Star Trek: Probe is a direct literary sequel to Star Trek IV: The Voyage Home, and it takes on the ambitious task of answering a question that the film deliberately left open: what exactly was the Whale Probe, and where did it come from? Rather than turning that mystery into a simple explanation, the novel expands it into something much larger, stranger, and far more connected to the wider Star Trek universe than one might expect from a late-1980s tie-in novel.
Overall, I would rate Probe three stars. It is an interesting and sometimes genuinely bold book, but also one that struggles with pacing and consistency. It has moments of real insight and imagination, followed by sections that feel slower or less engaging. Still, when it works, it works very well.
The novel picks up after the events of The Voyage Home, with Starfleet trying to understand the true nature of the Probe that nearly destroyed Earth. At the same time, political changes on Romulus open the door to an unusual and fragile cooperation between the Federation and the Romulan Empire. This political subplot adds an extra layer to the story, grounding the mystery of the Probe in a broader galactic context and giving the novel a more “classic Trek” feel, focused on diplomacy, uncertainty, and cautious trust.
The strongest aspect of Probe is without question its exploration of the Probe’s origin and creators. Through Spock’s mind meld and later revelations, the book presents the Probe not as a mindless machine or a hostile entity, but as an artificial intelligence created by an ancient civilization with a very specific purpose: to seek out intelligence comparable to its makers. The tragedy is that most life forms it encounters are so fundamentally different that it categorizes them as insignificant—“mites”—and therefore ignores the damage it causes.
This concept alone would already make for an intriguing story, but Probe goes much further. The most striking revelation is the history of the Probe’s creators and their destruction during what they called the Second Winnowing. The novel describes an invasion by vast, cube-shaped machines filled with countless small beings—clearly recognizable to modern readers as the Borg, even though the term is never used. These invaders are immune to the creators’ “True Language” and respond only with devastating force. The creators manage to survive extinction only by fleeing their world, scattering across space, while their sun itself is extinguished as part of the attack.
What makes this revelation so effective is how subtly it is handled. The book does not treat this as a shocking twist for the characters, but as a tragic piece of ancient history uncovered through fragmented memory and alien perception. The Probe itself was damaged in its encounter with these invaders, losing parts of its memory and unknowingly leading the same enemies back to its creators’ homeworld. This adds a layer of guilt and existential confusion to the Probe that makes it far more compelling than a typical god-machine antagonist.
From a franchise perspective, this is where Probe becomes especially fascinating. Decades before The Next Generation formally introduced the Borg, this novel retroactively places them deep in the distant past of the galaxy. It implies that both the Federation and the Romulans have, without realizing it, stumbled upon fragments of Borg-related history. Even the discussion of Erisian ruins and memory crystals suggests that civilizations encountered in later eras may have indirect connections to this ancient cycle of destruction and survival.
Spock’s role in the story is another highlight. His interaction with the Probe is less about domination or control and more about redefining intelligence itself. By broadening the Probe’s rigid criteria and helping it understand humanoid life as worthy of consideration, Spock prevents it from repeating its past mistakes. At the same time, he is unable to restore its lost memories, reinforcing the idea that some damage—whether technological or historical—cannot simply be undone.
That said, the novel is not without flaws. The pacing can be uneven, with some sections feeling overly dense or slow, especially when the narrative leans heavily into exposition. The Romulan subplot, while interesting in concept, does not always receive the depth it deserves. These issues prevent Probe from reaching the level of a truly great Star Trek novel.
In the end, Star Trek: Probe is a book that earns its three-star rating through ambition rather than execution. It does not always succeed, but it dares to ask big questions about intelligence, responsibility, and the unintended consequences of survival. Most impressively, it quietly lays conceptual groundwork that later Star Trek stories—especially The Next Generation—would explore in far greater detail. For fans interested in deep lore connections and early hints of the Borg, Probe remains a flawed but genuinely rewarding read.