One of the few episodes I bothered to watch whole when I caught it on TV was
Gillian of the Spirits. The
"tech progress forbidden, conservative 40s/50s" main world of the episode was, of course, very ASB. But I felt the story of the episode as a whole was decent and not badly directed. Quinn getting stuck in the "astral dimension" thing, the policeman finding the timer and being perplexed at what it even is (remember, no digital devices)... It had its moments.
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A list of worlds shown in
Sliders that were more intriguing to me than most:
Mardi Gras World - highly silly name for a TL with an actually interesting and fairly plausible historical backstory. It even has a reasonably predictable "Louisiana purchase averted" POD as its starting point. Better than the British North America TL they did in an early episode, "Prince of Wails".
Cuban Missile World - though it is a destroyed and depressing timeline to visit, I love the fact that it might as well be the same timeline as AH.com's
Cuban Missile War TL, written by Amerigo Vespucci a decade ago.
Nouvelle Versailles - another case of an alternate North America based on ATL developments in French colonies, and another case of a fairly interesting alternate world as a result. Even a decent placement of the POD, already in the 16th century. There must have been something in the water in the writer's room ! (Either that, or 'French America' AH just being such an untapped idea. The names of the two US stand-in countries descended from the French colonies are cheesy, but at least original. Of course, much of this world's present is depicted through the prism of lazy stereotypes about French culture, but hey,
Sliders was never a show focused on subtlety.
Sitting Moose World - a divergence during the early ACW and the rather far-fetched aftermath of that for all of North America, but otherwise a fairly original scenario based around Native American cultures. What brings the story quality down are the dumb stereotypes about living in tents or Indians running casinos for income. Based on something real, but implausibly exaggerated and wastes a big part of this TL's promise.
Edison World - not too plausible as a long-term outcome of electric technology developments, but I think this is the best tech-related ATL they ever did. At least it put some thought into how the big technological divergence would influence the daily functioning of society.
Public Transit World - I like it just for the cute zaniness of it, and the clear "Up your's, public transport haters !" commentary on the car-centricity of the OTL post-WWII US. Though a world without personal cars of some sort - electric cars or velocars, at least - is IMHO implausible, this was probably the best of the "LOL, random" worlds the cast visited.
Buttonwillow World - motorism and motor racing TL, with a divergence in 1915. Rather original.
Forest World - what we on AH.com would call a "Virgin Earth". Possibly a timeline with no human civilisation, and ironically enough, one of the most plausible timelines in the series.
Spiderwasp World -
Venezuelan scientists creating a genetically engineered monster arthropod ?! In 1987 ?!

Yeah, right...

That said, this is one of the better "spooky timelines" the cast visit during the course of the series. More of a horror/post-apocalypse setting than classic AH, but provided one of the more original threats to the characters.
Lemoore World - a very local divergence, and not terribly interesting, but it gets points for sheer originality. Successful modern secessionists in California, with their own comic-booky powerful microstate ? If nothing else, original.
Van Meer's World - the divergence is in the beginning of this timeline's universe, but its otherwise a carbon copy of OTL, just some twelve years in the past compared to our's. Both plausible and implausible at the same time. Not a good kind of "interesting" in my book, as it's basically an excuse for a time travel episode, but the idea behind the TL isn't that outlandish.
No Smoking World - honourable mention. Tobacco as a narcoticum worth trafficking, climate changes that explain the divergences. ASB, but a good satirical premise, especially for a non-smoker like me.
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Worlds I didn't like because they were overreliant on largelly uncharitable or offensive stereotypes:
British World - this should have been a showcase timeline visited by the cast, but it's severely let down by a clear unwillingness to bother with research and logic behind the scenario, and uses almost every British stereotype imaginable, including ones that have no grounding in historical reality.
Feminist World and
Breedin' World - two of a kind, really. Little else than loads of stereotyping and odd assumptions about male and female behaviour. What could have been an interesting topic to explore turned into a mush of awfulness with some creepy undertones. I concede that the first two seasons were better, but like with British World, at least one of these two worlds appeared during those first two series. So
Sliders has always had problems with plausibility and sensitivity.
Romani World - as diverse as Roma culture can get due to its global diaspora, this is another story for a pile titled "US writers don't get what Romani even are, beyond the fortune teller cliché". An ep about a Romani dominated North America is highly original, but it's clear they didn't bother to do much research.
Youth World - a blatant
Logan's Run ripoff, with plenty of dated 90s stereotyping of young people as genius computer nerds who want to computerise even public education. Just a bizarre TL, and the effortless takeover of the US by under 30 year olds has to be one of the least plausible things they've done.
Cannibal World - yeah, Papuan colonisers of North America have nothing better to do all day than to hunt for people and roast them on a spit.

Also lacks climatic plausibility, but No Smoking World also lacked that.
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Worlds that were just too implausible and silly, IMHO:
Ice Cream World,
Rollerblade World - really now ?!! These sound like one of the worlds we'd write for one of the AH.com series as a one-off joke in a throwaway remark.
Dinosaur World - even with ASBs in mind, this is just implausible. Dinos and mammals couldn't evolve alongside each other exactly like in OTL, due to the competition that would create in various ecological niches. Just an implausible world overall.
Hippie World - laughable 20th century ATL, loads of silly and forced parallelisms with OTL hippies, I could go on...
Corporate World - was clearly aiming for social satire, but went too over-the-top with the details of its setting.
Nude World - people invented clothes and other protection from the elements for a reason. People going around naked all the time would not have a survival advantage. This whole scenario feels like the showrunners' trying to satisfy their obsession with "pushing the sexy angle", regardless of how unsexy it comes across.
Pastiche World - dumb setting that thinks it's clever and meta, in an equally dumb and sorry final episode of the series.
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I tend to think the
Sliders premise lends itself better to a longer-running, planned-in-advance thriller series. Namely, an espionage thriller or heist thriller in a multiverse setting. It's just more sustainable than an episodic "TL of the week" (in the vein of a "planet of the week" in space opera series). When you go episodic with a multiverse series that has a cast of underequipped everymen as the adventurers, you sooner or later run into the issue of each timeline being underdeveloped, or more popular AH ideas running out quickly and forcing recycling and clichés.
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P.S. The one thing I don't like about Earth Prime, the
Sliders fansite, is that lacks a search function and the TLs/worlds in the travelogue are not linked to their respective episodes.