Warning: Spoilers ahead for season 5, episode 12 of “Fear the Walking Dead.”

A lone rabbi lights a Havdalah candle in an empty synagogue. He says the blessing over the wine, then the spices, then the distinctive braided candle.

Then zombies begin banging on the door of the sanctuary. The rabbi extinguishes the candle in the wine, picks up a bayoneted assault rifle, opens the door and stabs a lone zombie in the head with it. Outside, he encounters a teenage girl, Charlie, and saves her from more zombies.

“I’m Rabbi Jacob Kessner,” he says. “Welcome to Temple B’nai Israel.”

Charlie tells him she was drawn to the synagogue by the sight of an electric light, a rare sight in a world overrun by zombies. “It’s the ner tamid,” he tells her. “It’s the presence of God. She led you here.”

That’s the opening scene of “Ner Tamid,” the Sept. 1 episode of “Fear the Walking Dead” on AMC. Charlie is one of the series’ main characters, evidently (I’ve never seen an episode before). Rabbi Kessner is a new character. And Temple B’nai Israel is actually Congregation Beth Israel of Austin, Texas — my childhood synagogue, the place where I attended religious school and had my bar mitzvah, and my dad’s current workplace.

“Fear the Walking Dead” is a spinoff of “The Walking Dead,” a TV show based on a comic book of the same name. “Fear” is about a convoy of cars and trucks, a small community of people trying to make their way in a world in which most people have been turned into zombies (or “walkers” in the parlance of this franchise).

At one point, there is a shot looking down from the synagogue balcony — where my bar mitzvah portrait was taken. The sanctuary is my sanctuary. I can see the row where my family likes to sit. Seeing zombies surround my first spiritual home, a place I know like the back of my hand, is surreal and a little disturbing.

Jarringly, our synagogue’s god-awful ner tamid, or eternal light (a twisted, red-stained-glass monstrosity — the eternal lobster, my family calls it), has been replaced by a big silver plot device of a lamp. With an unspoken nod to the miracle of Hanukkah, keeping the eternal light on is a constant source of worry for the rabbi. He keeps it connected to a car battery — but he’s on his last one.

The next morning, after welcoming Charlie inside, Rabbi Kessner takes a Torah from the ark. (Time for a Sunday morning Torah reading? Torah is not read on Sundays, but it is read on Rosh Hodesh, the first day of the Hebrew month, regardless of the day of the week. Luckily, the episode actually aired on Rosh Hodesh!)

“Why do you still do that?” Charlie asks. “Tradition,” he says, quoting pop culture’s most famous Jewish line. “Tradition is very important. Now, more than ever.”

Later, though, Kessner admits that he has lost his faith — that the rituals are just “the rhythms of a life I’m trying to hang on to.” It’s clear he can’t keep going the way he has. He’s alone, weary (more so than your average rabbi) and his makeshift fortifications are no longer sufficient.

After two others from the convoy come looking for Charlie, he reveals that not only is he trying to keep zombies out, he’s also keeping a few of them in. They are his congregants. They holed up there together in the early days of the zombie apocalypse, but now he’s the last one still alive.

Kessner can’t bear to kill his congregants-turned-walkers and keeps a number of them locked up in Cohen Foyer, where I have often hung out, snacked and shmoozed. In one scene, he says Kaddish for them. I shed a couple of tears for Rabbi Kessner.

He’s not so different in temperament from the synagogue’s real rabbi, the rabbi of my youth, Rabbi Steven Folberg, who also served as a consultant on the episode. Kudos to him for a job well done; there’s a lot of Judaism in this episode, rendered with accuracy and sensitivity.

There are a number of nice touches, small details that bring verisimilitude to the episode’s Jewish moments. One of the convoy heroes hands Kessner a candy bar. The rabbi checks for a K on the back before eating it. He also has a small vineyard in the back where he makes his own wine. “Mogen David isn’t so easy to come by anymore,” Kessner says. Upon hearing that there are 36 people in the convoy, he jokingly wonders if he’s found the 36 tzadikim, the 36 righteous persons that our tradition imagines living in the world at any given time. And, during Havdalah, he observes the custom of looking at the candlelight reflected in his fingernails.

At one point, with dark irony, the rabbi notes the idea of techiyat hametim, the belief that in the world perfected, the messianic age-to-come, the souls of the dead will be resurrected.

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The Jewish actor playing Kessner is Peter Jacobson. He’s a great choice for the role, with a strong off-screen Jewish identity. “It’s just a part of me that I bring to any role,” he told the Jewish Journal in 2016. “Unless I’m told otherwise, I will be Jewish.”

The thrust of the show is about the search for a promised land, a place to stop wandering and settle down. It’s a wonder it took several seasons to introduce a Jew.

Charlie wants to stay at the synagogue. She thinks it’s the place they’ve been looking for. “There isn’t a water source for miles,” says one of the group’s leaders. (Actually, the synagogue is on Shoal Creek Boulevard, with the namesake creek just across the street. Not to mention the rainwater that periodically floods the sanctuary.)

During the episode’s climax, a couple of people are being attacked by zombies in the parking lot. Kessner stands on the bimah, blowing a shofar repeatedly, drawing the walkers inside and away from Charlie’s friends. (Apparently, loud noises attract zombies.) The Battle of Jericho echoes in my mind — except here, the shofar is a means of escape from home, rather than conquest of a new place to call home.

Rabbi Kessner and Charlie run from the room, most of the zombies now inside the sanctuary. They lock the doors. The zombies stumble around the bimah. One of them knocks over the treasured car battery. The eternal light goes out.

Finally, the rabbi leaves his sanctuary and joins the convoy. With a cabinet full of Judaica — a Torah, a Kiddush cup, the whole megillah (so to speak) — he joins their search for a place to call home.

“Fear the Walking Dead” airs on Sundays on AMC and can be streamed on iTunes, Amazon, YouTube and the AMC app.