Even the "NCIS" origin story for Austin Stowell has a Cracker Jack opening.

The impossibly rugged actor, 39, had tried to clear his mind after his February audition for "NCIS: Origins," the prequel series to the CBS police procedural (premiering Monday, 9 EDT/PDT, after the 22nd season opener of the OG series). After all, these were high stakes seeking the coveted role of young Leroy Jethro Gibbs, famously embodied by Mark Harmon for 19 TV glory-filled seasons. Gibbs is the guy in the "NCIS" universe, even after the iconic character retired to fly-fishing in Alaska when Harmon stepped aside in 2021.

So Stowell went off the grid, skiing with Charlie Jennings, his best friend and agent. It was robust bliss, until Stowell received a miracle message on the reception-patchy mountaintop saying Harmon, an "Origins" executive producer and narrator, wanted to talk.

"Mark wanted to speak to me, and you can guess what about," says Stowell, who went ski-hill rogue. "We had to get down the mountain and get reliable service ASAP. We race down that hill, take off our gear, jump into the Jeep, and fly down the highway to get reliable service. And we do. Mark calls. We literally pull off the highway."

Harmon signaled that Stowell would very likely get the role of his younger "NCIS" self in CBS' "Origins."

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"Mark was very complimentary. He said, 'It's been you from the second you walked in the room," Stowell says. "And he asked me, 'Are you ready for this?'"

Austin Stowell said after 'Star Wars' casting disappointment: 'Onward!'

Oh, he's ready. Stowell has been prepping for takeoff since earning a guest role in 2010 on "NCIS: Los Angeles" and playing a big-hearted swim champion in two "A Dolphin Tale" movies alongside KrisKristofferson. ("He was an amazing man, talk about a real-life superhero," Stowell says. The music legend died lastmonth at age 88).

Stowell even had a serious run at a major "Star Wars" movie role with J.J. Abrams. He was flown to London's Pinewood Studios and donned the "Star Wars" costume and makeup for a day. But the role went to another actor. "Of course. it's devastating," Stowell says. "This is a wonderful job, but the process is tough. But I always have said the same thing when I don't get a job: 'Onward.'"

Abrams introduced the actor to his mentor, Steven Spielberg, landing Stowell the role of U-2 spy plane pilot Francis Gary Powers in Spielberg's 2015 war drama "Bridge of Spies." That led to parts like the husband of tennis great Billie Jean King (Emma Stone) in the 1970s tennis drama "Battle of the Sexes" and smoldering Josh Templeman in the 2019 rom-com "The Hating Game," which paved the way for his front-runner status in the "NCIS: Origins" casting race.

Austin Stowell was hard to reach after 'NCIS: Origins' audition: 'So Gibbs'

After his memorable audition, "Origins" executive producers Gina Lucita Monreal and David J. North faced familiar reception issues when they called to officially offer Stowell the role. "He was out in a cabin in the middle of the woods with no internet and almost missed our call," North says. "I got off the phone and said, 'That's so Gibbs.'"

Says Stowell: "One phone call that changes your life. And two phone calls that I nearly missed. But the Hollywood gods were looking out for me."

Monreal says his physical likeness to Harmon was important. But "Origins" places Gibbs in 1991 as a green Naval Investigative Service officer at California's Camp Pendleton, where the former Marine sniper deals with the murder of his wife and daughter. That required a presence that Stowell, who can turn on full Gibbs with one soulful-eyed look, inhabited.

"In this 'Origins' moment, Gibbs is broken," Monreal says. "We had to find someone who exuded that energy. That was just as difficult as the physical piece of this character."

In "Origins," Gibbs is far from the ultra-competent special agent in command. He's an unsteady newbie dealing with his trauma after failing his psychological evaluations. It was this raw premise, based on "NCIS" lore, that made Harmon's son Sean, who had played the young Gibbs in "NCIS" flashbacks, pitch "Origins." (He's now an executive producer.)

Young Gibbs has immediate "Origins" supporters, including Special Agent Lala Dominguez (Mariel Molino) and his eventual mentor Mike Franks (Kyle Schmid), whose power mustache is a scene stealer. "He's electric," Stowell says. "I already joke with him that we are going to see Franks' mustaches at Halloween parties."

Stowell dived into research, reading 1980 U.S. Marine manuals to understand the life and taking long runs with a weighted-down backpack. He stepped up the rifle training he learned in 2018's Chris Hemsworth-led Afghanistan war film "12 Strong" to look silently confident with Gibbs' rifle. Stowell still binge-watches "NCIS" episodes to pick up small mannerisms.

"I want to embody his essence. There are Gibbs-isms," Stowell says. "There is a head nod and he has this stare."

That stare, and Harmon's intense blue eyes, are so pivotal that Stowell wears blue contact lenses over his naturally green eyes. Seeing the world that way changes his perspective: "They make me feel different," he says. "They're such a powerful tool."

Harmon appears near a campfire in the "Origins" opening. The camera zooms up close on his stare, which morphs into Stowell's haunted look.

"It's not the passing of the throne; Mark Harmon has the throne," Stowell says. "If it's the passing of the torch, he lit the torch. It's my job to show how this kid becomes that guy that people admire so much. But I get to play one of the world's greatest heroes. And that's pretty rock and roll."