My niece and nephew, both teens, are watching Peter Jackson’s “The Lord of the Rings: The Fellowship of the Ring” for the first time. They are in the basement, I am upstairs, web-surfing all things Tokyo. (Godzilla vs. Smaug? I’m in.)

All I hear are dragon shrieks and thunderous fire-belching that rumbles the floor and walls and surely rattles the television, making it shimmy and shake on its spindly base. (Wait. I am later told that Smaug the dragon is not in this “LOT” installment. What then was I hearing? Gollum’s hissy, phlegmy rasp? A bombardment of unbridled Tolkien imagination? Hobbit flatulence?) 

I was well into adulthood when this first film in the “LOT” trilogy was released 18 years ago, and by then I wasn’t much for elves and wizards and hobbits. It’s all very childlike to me, which is also why I didn’t do backflips for “Game of Thrones,” though I mostly enjoyed that rollicking, bloody, gleefully nakedy, defiantly impenetrable series.

I grapple with most fantasy archetypes. I can barely do swords. Harry Potter, which arrived awfully late to the tournament of genre clichés, is a baffling bore, an embarrassing ecosystem of such contrived, feebly derivative Halloween, D&D and Renaissance Fair poppycock that my aversion to it is nigh boundless. 

Wizards, wands, witchcraft, trolls, potions, flying broomsticks, spells, sorcerers, centaurs — such are the tropes of an impoverished imagination. Such is the desperation of a starved (and benighted) readership and viewership. It is expressly for innocents, naifs, children, the like.

My niece, bless her roving, fecund mind, rabidly adored Harry Potter a few years ago. We don’t speak of it, lest one of us goes bald from mutual hair pulling. I don’t know what she thinks of the Christlike Chosen One now, and I don’t want that information. The kids watch “Lord of the Rings” as I type, and I do not know what they think of it, as they’re in the middle of Middle-earth and all. 

I hope they like it. It’s rather good; it’s just, at this late date, not my bag. Gandalf, “my Precious,” the hirsute feet, the Shire, Orcs — I’ve moved on. Yet I endorse it. And I’m not one quick to sanction fantasy flicks.

A few exceptions: “A Trip to the Moon” (1902); “King Kong” (1933); “The Wizard of Oz” (1939); “Beauty and the Beast” (1946); “Willy Wonka & the Chocolate Factory” (1971); “Legend” (1985); “Babe” (1995); “Spirited Away” (2001); “Coraline” (2009). (Please don’t ask where “Avatar” fits into this list. It doesn’t. It is banished, with prejudice.)

I think I need more fantasy in my life, despite my allergy to it and most things science fiction. (Exceptions: “2001: A Space Odyssey” (1968); “Solaris” (1972); “Star Wars” (1977); “Close Encounters of the Third Kind” (1977); “Alien” (1979); “Blade Runner” (1982); “The Fly” (1986); “Serenity” (2005); “District 9” (2009); “Moon” (2009); “Ex Machina” (2014).)

Nowadays dystopian scenarios are hijacking the fantasy and sci-fi worlds — from fashionable post-apocalyptica to ever-tedious zombies — with mixed results. Film-wise, dystopian zeniths are the visionary, crazily exhilarating “Mad Max” epics. (Other highlights off the top of my head: “A Clockwork Orange” (1971); “Brazil” (1985); “RoboCop” (1987); “Children of Men” (2006).)

In fiction, fine contemporary classics — “The Handmaid’s Tale,” “The Road,” “Never Let Me Go” — chafe against new mediocrities like Emily St. John Mandel’s “Station Eleven,” which at its best reveals genre fatigue. 

I’ll take dragons over such drags. A trio of trainable dragons lit up “Game of Thrones” with awe and grandeur and strange, scaly pathos. Smaug is a juggernaut, a fearsome, fiery Middle-earth monster considered to be the last great dragon of the realm. (Yeah, I had to look that up.)

I may be the sole fan of the crunchy 2002 dragon drama “Reign of Fire,” in which Matthew McConaughey and Christian Bale combat a futuristic (totally dystopian) infestation of those winged, fire-spraying dinosaurs. The sheer force of its perverse and pummeling premise — not to mention top-drawer dragon action — dragooned me to full appreciation of this fantasy tale.

And what about comic-book superheroes? “The Dark Knight” (2008) remains an adult-geared masterpiece of mayhem and menace. One or two of the early Spider-Man movies are efficient. I like “Iron Man” (2008) and the profanely spoofy “Kick-Ass” (2010) — both are fast and funny — and, more so, the bleak, ruminative Wolverine installment “Logan” (2017). I have very little use for the rest of it.

From the basement, I hear Howard Shore’s strident, overbearing score, more earth-rattling noise, stadium-fuls of yelling, screaming and bellowing. Drama is happening in “The Lord of the Rings.”

And then: hush. The niece and nephew emerge from Lower-earth to the living room. The spectacle is over. We inquire.

Her: “It was good. I’m excited for the next part. I’m looking forward to the hobbit movies, too. This one is just really long.” 

Him: “It’s exciting and there’s tons of fighting. but it’s more than three hours. Still, you don’t get bored.”

Length, damn length. This “LOT” runs a savage three hours and 48 minutes. Fantasy always seems to run interminably long (“Avatar”: two hours, 42 minutes), even when it doesn’t (“Legend”: one hour, 34 minutes). To binge all 73 episodes of “Game of Thrones” would take three days and 16 minutes, enough time for a weekend getaway to Bermuda.

But fantasy and sci-fi are all about girth and sprawl. Poundage of detail and characters, world-building and mythologizing is their very DNA, their showoffy M.O. Glimpse any fantasy novel worth its weight in gibberish; just don’t try and lift it.

Epic, capital E, is the primary aspiration. It’s all about blowing the mind, overwhelming the senses. For this skeptic, this mostly invites chronic eye-glazing. Fantasy does not stir fanaticism. This fanboy might have just become a fan-man.