Alan Dean Foster's 1974 Star Trek Log Two contains 3 stories adapted by Foster from the screenplays of the early 1970s animated cartoon television series that had been spun off from the original acted series of half a dozen years earlier.
Never having seen the animated series, I can make no comparison between the original episodes and Foster's adaptations, in the way I occasionally have with James Blish's adaptations of the original series. I can comment, though, that the cartoon series evinces some differences from the acted series. Here, for example, we have a handy piece of technology called a "life-support belt," which creates a very thin but tough force field, meaning that characters can stomp around in vacuum or poisonous atmospheres as if in a spacesuit. And of course another product of the animated nature of the show is that we have a few alien crew members--three-legged and three-armed, cat-like, or winged, for example--who would have been too expensive to produce every week via elaborate costuming, along with other odd aliens occasionally encountered. These differences are commonsensical, at least in science fiction, and they do not draw attention to themselves unduly.
"The Survivor," whose original screenplay was by James Schmerer, starts with one of those cliched comically boozy Christmas parties, only now not in some mid-twentieth-century office on Earth but aboard the Enterprise in deep space. Here, "on the edge of the Romulan Neutral Zone" (1975 Ballantine paperback, page 6) the Enterprise stumbles upon a "compact and very expensive" (page 8) yacht of Federation make, now wrecked and engineless...yet with one life reading (page 9). The survivor beamed aboard appears to be "a living legend--the foremost interstellar trader of [their] time, Carter Winston," a man "[w]ho...acquired a dozen fortunes, only to use his great wealth again and again to aid Federation colonies in times of need or disaster" but who has "been out of touch with civilization for five years" (page 15) and presumed dead. The border of the Neutral Zone, however--even accidental violation of which brings a penalty, per treaty, of confiscation of the trespassing ship (pages 23, 41, and 44)--is a dangerous place for wrecked ships and functioning ships alike...
In "The Lorelei Signal," whose original screenplay was by Margaret Armen, an admiral from "Starfleet Science Center" (page 72) sends Kirk to investigate a sort of interstellar Bermuda Triangle, an area in which in the past 150 years a starship from the Federation, the Romulan Empire, or the Klingon Empire has disappeared "precisely every twenty-seven point three-four star-years since its initial mapping" (page 75). Now, this "precisely" grates a little--that is, for these infrequent but regular losses to occur, a ship needs to be trundling through the area at exactly that time, not a month earlier or a week later, for example--but despite that, the story is entertaining. Once the strange signal comes out of the void, a "wavering tone" that is "sensuous, haunting[,] and unmistakably melodic," not to mention "thoroughly captivating" (page 79), the reader of course recognizes the problem more quickly than the Communications Officer. Yet although Lt. Uhura at first misses her chance to head off the situation--because otherwise, I suppose, there would be no plot--naturally she eventually will realize the danger and take charge.
"The Infinite Vulcan," whose original screenplay was by Walter Koenig--the actor who played Chekov in the acted series--has the Enterprise "ordered to survey a new planet recently discovered at the Federation-Galactic fringe" (page 129). "The discovery of a potentially colonizable world [takes] precedence over any but the direst emergency." This planet is "downright lush," and "[e]verything seem[s] to point to a choice discovery, just waiting for her first load of Federation settlers--until Sulu's surface probes located the city" (page 129). So we have the ol' mysterious uninhabited city schtick, with a mysterious "electronic probe of some sophistication" (page 133), and funky aliens. And we also have, um...with complete disregard of the cube-square rule--by which the mass of an enlarged object increases according to the cube, whereas cross-section of vertical bone or girder increases only according to the square, such that a quadruple-sized person weighs 64 times the original but has only 16 times the weight-carrying bone are--a human clone "just under twenty-four feet" tale (page 146).
Strangely, as with the previous book in the series, a minor punctuational problem sometimes crops up. When quoted speech continues without break from one paragraph to another--the speaker has a fair bit to say, that is, and breaking it into more than one paragraph makes it easier to understand--the convention is to keep opening quotation marks on the beginning of each paragraph but not use closing quotation marks until the end. Speech flowing across three paragraphs, for example, thus will have three beginning quotation marks--one set starting each paragraph--but then only a single set of closing quotation marks, at the end of the quote. Usage here is a bit spotty, occasionally correct but sometimes incorrect--though not as bad as in Star Trek Log One--and 'tis a minor-ish annoyance. I think it likely, however, that the error is not Foster's but that of some random dingus down in Copyediting.
In any event, Alan Dean Foster's Star Trek Log Two may begin with stories originally from a cartoon show, yet the adaptations are well done and--despite the eye-catching but silly 24-foot giant in the last tale--aimed at an adult audience, and for any fan of the starship Enterprise and its historic five-year mission, the book will be a swift and enjoyable read of 4.5 or perhaps 5 stars.