"Reacher" Season 4, based on Lee Child's book, "Gone Tomorrow," aired this week on Prime Video. It stars Alan Ritchson, Agnez Mo and Anggun.

AGNEZ MO (L) and Anggun star in "Reacher," which wrapped up its fourth season this week. Photo courtesy of Starz UPI Agnez Mo arrives for the iHeartRadio Music Festival at T-Mobile Arena in Las Vegas in 2023. File Photo by James Atoa/UPI UPI Anggun arrives on the red carpet during the Rome International Film Festival in 2009. File Photo by David Silpa/UPI UPI Alan Ritchson arrives on the red carpet at Liongate's "Ordinary Angels" New York premiere in 2024. File Photo by John Angelillo/UPI UPI

NEW YORK, Sept. 19 (UPI) -- The hulking vigilante in the crime drama, Reacher, barely makes it out of this week's Season 4 finale alive thanks to a pair of highly trained assassins unlike any he has ever confronted.

Spoilers ahead.

Based on Lee Child's book, Gone Tomorrow, the season kicked off with former military police investigator Jack Reacher (Alan Ritchson) meeting a suicidal stranger on a subway, then trying to figure out why shadowy government agents, local law-enforcement, reporters and gangsters want what she had in her possession just before she died.

"Reacher is not going against yet another big dude. He's going against these two Asian women who are just very manipulative, but, also, at the same time, strong, dangerous and calculating," Agnez Mo, who plays Lila, told UPI in a recent Zoom interview.

"The fact that Lila sort of lured him into this emotional connection space where Reacher hasn't really been in that space, at least before in the past three seasons. He cares about her and some of the scenes and some of the choices that Alan made in those scenes, people started to feel like: 'Oh, is he falling for Lila? Does he really care?' And he's really worried about Lila."

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The season finale shows Lila and her accomplice Amisha (Anggun) attack the much bigger Reacher with their deadly Indonesian weapons called karambits.

"What makes it even more beautiful -- man, I sound like a real villain right now -- is he's just being cut left and right and, for a very psychotic sense of it, they're enjoying that. I think that's the reason why they don't really use guns like that, because they like to see the victims suffer," Mo said.

"It's not just about the killing. They enjoy the 'how,' not just the 'what.' Not just the result."

Their use of the short, curved blades means that Amisha and Lila must get very close to their enemies, meaning there is very little room for error when the actresses practice and film with the weapons.

"This is another day at our job, at our work, and it's like, 'OK, we've done this hundreds of times with other victims,'" Mo said. "Both Lila and Amisha got cocky and we forgot that Reacher is Reacher."

Anggun said she and Mo spent months training for their roles in the show, particularly the epic fight scenes in the finale.

"We filmed that bit for three, four days, but leading up to that, we prepared. Reacher is being shot chronologically, which makes it easier," she recalled.

"We had the whole five or six months that we were in Toronto as preparations, because whenever we're not shooting, then we will be back in the studio, rehearsing and training with the stunt team," Anggun added.

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"Both villains are Indonesian and they use karambits and they use pakayuns as their main ways of fighting, which is new to both of us, because we're not from that world."

Although the women are dispassionate when quickly dispatching most of their victims, they both appear to take great pleasure in trying to bring down Reacher.

"You can see that rage," Anggun said. "But, also, the relief, I guess, that, finally, we're facing him."

The actresses enjoyed playing characters that other people, including Reacher, might underestimate because of their size and gender.

While Lila is posing as a concerned reporter and romancing Reacher in the early episodes, Amisha says nothing, leaving her motives murky.

"It's not fun killing anyone, but it's fun being that persona, being that character, doing something that is so far away from who we are," Anggun said. "It gives us some kind of a superpower."

The season co-starred Chris Marquette, Sydelle Noel, Kevin Weisman, Marc Blucas, Kevin Corrigan and Kathleen Robertson.

The show has already been renewed for a fifth season.