With this week’s release of J.J. Abrams’ Star Trek, I thought the time was right to look back at an earlier big-screen installment of the franchise. But which one? Despite the enduring popularity of the Star Trek brand, few of the Trek movies could be classified as blockbusters. Even The Wrath of Khan, the current fan favorite among the original-cast adventures, only grossed a fairly unremarkable $78 million domestically. As of earlier this week, the biggest hit out of the Trek movies is the series’ fourth entry, 1986’s The Voyage Home, which was the only pre-Abrams Trek movie to gross upwards of $100 million.

So why, out of ten Star Trek movies to date, was this the one that struck a chord with moviegoers? Much of it had to with the idea that it was, to quote a recent essay at The House Next Door, “the Star Trek film for people who don’t actually like Star Trek all that much.” The Trek franchise won legions of fans with its futuristic stories set in far-flung worlds, but others were turned off by the more science fiction-heavy aspects of the show and movies. So, by setting the majority of its story in 1980s San Francisco, The Voyage Home gave devotees another agreeable two hours to spend with their beloved Enterprise crew, and allowed non-fans to enjoy a Star Trek movie without feeling so, for lack of a better word, geeky. When the film hit theatres over Thanksgiving weekend, it took in the largest opening weekend haul of 1986, and eventually became one of the year’s biggest hits.

Of course, there were other factors that contributed to Star Trek IV’s box office success. Even more than most Trek movies, this one was pretty family friendly, with a few mild expletives (or, as Leonard Nimoy's Spock calls them, “colorful metaphors”), but nothing stronger than a “damn,” “hell,” or “double dumbass on you!” Its timely save-the-whales message didn’t hurt either. Through some deliciously convoluted plot developments, the fate of the human race depends on the survival of two humpback whales, which allowed director Nimoy and his co-screenwriters to shoehorn a lesson into the story in the classic Trek fashion.

But most importantly, The Voyage Home was- and still is- funny. The 1980s were the heyday of the fish-out-of-water comedy, and by placing the familiar Enterprise crew four centuries into the past, the film afforded the characters plenty of opportunities to get laughs from their cluelessness about 20th century life. The film, to its credit, makes the most of the disconnect between the characters and their unfamiliar surroundings, and our knowledge of the crew’s personalities only makes it funnier. So when engineering whiz Scotty (James Doohan) comes face to face with an old-school computer, or Chekov (Walter Koenig) wanders around San Francisco inquiring about “nuclear wessels” at the height of the Cold War, the comedy is richer than it would have been had the characters not been so well established.

One of the better surprises the movie holds is William Shatner’s performance. In the more serious Trek episodes and on the series, Shatner had a tendency toward hamminess, especially when the situation called for big emotions. Here, in a more lighthearted movie, Shatner isn’t exactly natural, but that’s the point- his cartoonishly stalwart bearing allows for a nice contrast with the casualness of the eighties setting. One of the more amusing running jokes in the film is that while Kirk repeatedly admonishes Spock for looking out of place, Kirk really doesn’t fit in any better, although he’s convinced that he does. Because of this, he’s able to sell lines like the scene in which he feels the need to apologize for Spock, explaining that he’s an old hippie who “took too much LDS.” Rather than leaning on the line to milk the joke, Shatner practically throws it away, which makes it that much funnier. In recent decades, Shatner has become a parody of himself, so it’s nice to see him getting intentional laughs.

Aside from the comedy, the movie is more uneven, but it’s still one of the better Star Trek movies. Yes, the plot is ridiculous, but that’s part of the fun. Too many big-budget franchises play it safe in their narratives, setting up a formula and sticking to it from film to film. With Star Trek (especially the movies) the formula is less in the plot than in the characterizations- Kirk’s unconventional but instinctive leadership sense, Spock’s unflappability, Dr. McCoy's (DeForest Kelley) cantankerousness, and so on. Because the characters are firmly established, the filmmakers could afford to be more adventurous with the stories themselves. It’s hard to think of another movie series that could get away with a plot that hinges on an alien intelligence that communicates in humpback whale-song, but somehow The Voyage Home makes it work.

Of course, maybe I’m biased. After all, Star Trek IV was the first Trek movie I saw as a kid, although had already seen quite a few episodes from the series. But while I remember laughing a lot back then, it plays better for me now that I’ve doubled back and caught the rest of the movies. One may not have to be a fan of Star Trek to enjoy the comedy scenes in 1986, but a working knowledge of the movies, especially the second and third films, makes the 23rd Century sequences much more worthwhile. The Voyage Home brings the storyline that began with The Wrath of Khan to a satisfying end in the movie’s final scene, in which the crew takes a long, loving look at their new ship- the all-new Enterprise A. It’s an obvious ending, but at the end of this long, strange journey, the crew has earned it, and so has the movie.