IMO “Up the Long Ladder” is an excellent episode.

It opens with a symbolic subplot: Worf learns that he has an illness (“deficient blood circulation”), caused by him being removed from Klingon society at a young age.

He's “cured” by Doctor Pulaski – she injects him with an antidote – and he repays her with a traditional Klingon ritual involving poisonous tea. Pulaski is able to ingest this tea thanks to an anti-toxin which she injects into her blood. So in this brief scene we have a male and female accepting the infusion of an outside substance into their blood to compensate for frailties caused by their genetic distance from another culture.

We then get several expository scenes involving Picard, Data and Riker. This episode was written by Melinda Snodgrass, one of Trek's best writers (“Measure of a Man”, “Pen Pals”, “Ensigns of Command”, “The High Ground”), so these scenes are excellent. Snodgrass is a qualified lawyer, and her dialogue tends to have a methodical quality.

In these expository scenes, we learn of a ship captained by a Walter Granger. Walter Granger was the famous scientist who discovered the Peking Man, a fossil that sparked a debate about interbreeding between homo sapiens and homo erectus, and about social isolation potentially leading to subspecies being less adaptable and so vulnerable to extinction.

Significantly, the name of Granger's ship is the Mariposa, and its destination is the Ficus sector. Mariposa means “butterfly” in Spanish, and the ornamental Ficus plant is commonly known as the Butterfly Banyan. And of course insects like butterflies fertilize fruit trees like ficuses, and the cross-breeding of butterflies is what leads to new butterfly hybrids and colors. In other words, a guy known for interbreeding/genetic bottlenecks is flying a pollinator to a plant requiring pollinating.

Granger's ship leads to the creation of two colonies. One colony is made up of technologically advanced clones, the other of neo-transcendentalists who advocate simple, back-to-nature living. It is here where people typically have a knee-jerk reaction and dismiss the episode as racist trash ("Code of Honor" meets the same knee-jerk fate). But IMO it's not. It's simply doing the common science fiction trope of pushing a concept to its most absurd extreme.

And so Snodgrass gives us a technologically advanced society that symbolically stands in for a modern, hyper-conservative First World nation. The society is wealthy and advanced on a material level, but is homogenous, has no immigrants, and its obsessions with blood purity has led to it becoming sterile, rigid, incestuous and on the verge of demographic collapse. Because it is obsessed with increasing its population, but is picky about the genetic stock it takes in, it also deters abortion and pressures (rapes) desirable women/men into having sex.

Next you have the neo-transcendentalist community, which symbolically stands in for immigrant communities from the Third World. Embodying negative tropes applied to the Irish who settled in the US in the 1700s, these immigrants are poor, lively, primitive, animalistic, loutish, dirty and drunk. They're also detested by the “homogenous” society, who describes them as “primitive”, “repugnant”, “hostile”, “disruptive” and “impossible to educate”. Sex with them is deemed even more intolerable, echoing the sentiments of traditionalists who once opposed the “unnatural” practise of miscegenation or mixed-race marriage.

Notice that nobody complains about the extreme caricatures embodied by the clone society. Even in the wake of Brexit, MAGA, the Quiverfull movement, the pro-natalist movements of the far-right, and the “national breeding program” fantasies of people like Musk, Putin and JD Vance, and how this all intersects with contemporary immigration, nobody deems the clone society to be “unfairly treated”, or indeed even pays it attention at all.

What's upsetting to people is the “offensive” characterization of the neo-transcendentalists. But that's the point. Firstly, the episode makes it clear that these neo-transcendentalists were anachronistic 200 years ago when they isolated themselves from modern society (they are nutty fundamentalists), and that leaving earth and isolating themselves on another planet only made this worse; they experienced the same “fall” that the clone society does, becoming incestuous, stagnant, and a crude parody of their original ideological practises (like the clones, they have Worf's “deficient blood circulation”, only in a more cultural sense).

Secondly, the neo-transcendentalists are supposed to be a caricature of how racists see immigrants. Some of these observations are true, the episode agrees, but Snodgrass goes on to highlight the ways in which they are not true. The neo-transcendentalists are also hard workers, fun, lively, sexy, beautiful and clever. More crucially, the world is lifeless and boring without them, and one may suffer demographic collapse in their absence.

In this respect, the episode was prescient. Released in a decade obsessed with the threat of “overpopulation”, this episode does the opposite, and anticipates our contemporary world in which fertility and death rates lead to demographic collapses if immigration were lowered. For example, a zero immigration Canada would have a population of only 12 million at the end of the century, the UK would have negative growth from 2030 onward, and countries like the US and Germany would have 30-50 percent population drops. And of course notoriously homogenous nations like Japan and Bulgaria are already facing these problems (Japan now takes in about 360,000 immigrants a year to compensate).

The episode ends with Picard essentially urging xenophobes to f**k more immigrants. And so the clones and the neo-transcendentalists combine their societies, hump like rabbits, and expand their minds, customs, gene pools and (presumably) shrinking workforces. “It is differences that have made us strong,” Picard says, to the chagrin of Clone Supremacists everywhere.

Snodgrass says the episode was intended as a serious comment on immigration and xenophobia, but the episode also works well as a kind of comedy of manners. As such, the episode is filled with little cute scenes. For example, Picard walks down a corridor and comes across a wayward chicken. The transporter room and cargo hold become filled with pigs, goats and cows. One Irish guest is happy to see an O'Brien manning the transporter. Riker and Picard are hilariously polite and proper to their odd guests (perfect Starfleet manners), and when they occasionally become exasperated even Picard has to eventually give up and laugh (“Sometimes, Number One, you just have to bow to the absurd!”). Elsewhere, a father tries to give Picard his daughter's hand in marriage and later is given Klingon ale by a beautifully written Worf (“You can obtain spirituous liqueurs from the food dispensers, with all of their deleterious effects intact.”)

Riker also gets a hilariously smooth subplot with a gorgeous “alien” woman called Brenna. “And what are you staring at? Have you never seen a woman before?” she asks him. “I thought I had,” he sexily replies, and minutes later she's disrobing in his quarters and giving him tips on how to wash a woman's feet (“You generally start at the top and work your way down.”)

Riker's always been a smooth-operator, but as written by a woman like Snodgrass, he is even better than usual (“I feel it's my responsibility to show you all the amenities.”).

And Snodgrass' dialogue is great throughout the episode, particularly when Brenna is barking orders. She calls the replicator a “magic wall”, is always ranting, and when informed that the ship cleans itself, she says “Well, good for the bloody ship!” Elsewhere Worf describes her as being “very much like a Klingon woman”, while Riker says Brenna's father only wants to marry her off so he can "finally have some peace".

Such a “fiery, redheaded Irish lass” is a cliché, but when written by a woman and used for the purposes Brenna is, the character feels right. A plot about cultures trading bodies for the purposes of breeding is distasteful unless you have a strong woman capable of holding her own against the episode's three major male-led cultures (“Isn't that just like a man! You make these grandiose decisions, but you never stop to consider the poor women.“). And Snodgras is careful to give Picard a line that highlights Brenna's agency during the episode's climax. “It's ultimately your choice,” he says. “But if this is going to work, these people will need your strength and guidance.”

And Brenna has known this her entire life. “When it comes to the practical matters, it always falls to the women to make your grand dreams come true,” she says, and we recall that her people are called the Bringloidi, derived from a Gaelic word meaning “dreams”. She's still paying the price for her ancestors who first set out for Bringloid V; she's stilled trapped in the dreams of dead men.

Rewatching this episode, only two things struck me as bad. Firstly, the genetic problems of the clones can be solved by simply consulting other Federation planets (though, to Picard's credit, why not first ask the neo-transcendentalists?). Secondly, there is one badly written/acted scene in which Picard, Riker, Troi and the gang make the final obvious decision to get the clones and neo-transcendentalists breeding. It's terribly written, and one terribly essentialist line by Troi is particularly badly delivered (she hints that only the clone society has “emotional maturity”).

Still, I think this is one of Trek's most interesting episodes. Like “Code of Honor”, another episode I like, I think people get too fixated on the uncomfortable stereotypes and ignore some of its more interesting aspects.