“Twilight” cemented the fact that series wasn’t afraid to take its time setting up and unfurling storylines, with Kate’s assassin, Ari Haswari, having been introduced in the previous season but remaining MIA after the first season finale, “Reveille.” It served to create numerous new storylines as well, with memories of Kate and her murder haunting the characters and continuing to reverberate through the series long after her death.

Advertisement

“Under Covers” (season three, episode eight): The introduction of Ziva David to NCIS was one that rankled some viewers, partially because she was such an unknown element, but mostly because she wasn’t Kate. While not exactly a warm and cuddly character in her first few episodes, Ziva had a definite spunkiness that began to emerge with prolonged exposure to her new co-workers. “Under Covers” was the first time viewers saw that side of her on full display, thanks to an assignment that necessitated that she and DiNozzo pose as a pair of married assassins. Not only did the episode provide Ziva with an opportunity to charm viewers who’d been on the fence about her character, but the goings-on between the sheets—while simulated in order to keep up appearances in case their hotel room had been bugged—kicked off a “will they or won’t they?” between Ziva and DiNozzo that lasted until her departure at the beginning of season 11.

“Hiatus, Parts 1 & 2” (season three, episodes 23 & 24): Gibbs spent the majority of the first three seasons as the Gary Cooper of the NCIS team, preferring action to words whenever possible and divulging only as much personal information as absolutely necessary. In the two-part finale of season three, however, viewers finally got a few key pieces of the puzzling past of Leroy Jethro Gibbs. After being caught in a bomb explosion, Gibbs fell into a coma, during which viewers were treated to flashbacks of his earlier years, the most revelatory of which showed that his first wife, Shannon, and his daughter, Kelly, had been killed in a car crash caused by a sniper.

Advertisement

Not only was the information a surprise to viewers, but, perhaps even more unexpectedly, Gibbs had also kept the existence of Shannon and Kelly from Ducky and Director Shepard, the two characters who’d shared the most history with Gibbs. An even bigger surprise was in store at the end of “Hiatus, Pt. 1,” however, with Gibbs awakening from his coma with amnesia.

As a result, the second part of “Hiatus” proved almost as informative, introducing Gibbs’s heretofore-unmentioned NCIS mentor and former partner, Mike Franks, who was called out of retirement to help Gibbs regain his lost memories. With Gibbs temporarily out of commission, the events of “Hiatus” forced DiNozzo to take control of the team, giving him the opportunity to prove that, despite his often flippant attitude on the job, he possesses the temperament to take command when the situation demands it.

Advertisement

“Judgment Day, Part 2” (season five, episode 19): The first part of the season-five finale concluded with Jenny Shepard being killed in a gunfight, a moment with lasting implications on the series, not least of which is the resulting promotion of Leon Vance to director of NCIS. As Tony and Ziva deal with the realization that Jenny might still be alive were it not for their actions, Gibbs sets off to exact revenge, displaying a side of himself that only a few unfortunate individuals had ever experienced. As one might expect, there’s a great deal of grief expressed during the proceedings, along with many repercussions for the team: By the end of the episode, McGee and DiNozzo have both been reassigned, Ziva is on her way back to Israel, and Vance is handing Gibbs the personnel files for his new team. Sure, season six kicks off with the obligatory “getting the band back together” story, but this is a classic cliffhanger and it’s delivered well.

“Heartland” (season six, episode four): If “Hiatus” served to explain some of the sadness behind Gibbs’ eyes, then “Heartland” provided the origins of the occasional twinkle by finally introducing viewers to his father, Jackson, played by former Waltons patriarch Ralph Waite. When a case takes Gibbs back to his hometown for the first time in decades, the long silence between father and son is finally broken, with Gibbs letting his inner teenager run free for a brief moment when his father unveils the sports car he’s refurbished and had waiting for him in the garage. While there are certainly serious moments throughout the episode, there’s a lot of lightness, much of it derived from the audience sharing the excitement of Gibbs’ team that they’ve finally found out something about the boss’ origins.

Advertisement

“Truth Or Consequences” (season seven, episode one): For all the media attention that Cote de Pablo’s departure from NCIS received, something often glossed over in the coverage was the fact that the series had already gone through the process of replacing Ziva a few seasons earlier. At the end of season six, Ziva was taken hostage by an Islamic terrorist, held captive, and tortured. While a search-and-rescue effort proved successful, the overall effects of the experience took several episodes to play out. “Truth Or Consequences” is a psychologically harrowing hour of television all by itself, however, with DiNozzo suffering through a brutal interrogation in Somalia, refusing to divulge any information, and hanging tough until Gibbs arrives to commit an act of unadulterated badassery.

“Shiva” (season 10, episode 12): As the highest-rated episode in the history of NCIS, more than 22 million viewers already know what went on in “Shiva,” which detailed the aftermath of the murders of Eli David, Ziva’s father, and Director Vance’s wife, Jackie. Although the desire to exact revenge on those responsible extends throughout the rest of the season, “Shiva” delves into the emotional complexities of Vance and Ziva suddenly and unexpectedly losing their loved ones. For the first time, Vance and Gibbs are finally on the same page, with Vance admitting that, for better or worse, he now has a frame of reference to what Gibbs went through when he lost his wife and daughter. The episode also serves as the beginning of the end for Ziva on the series, with the death of her father sending her on a path that ultimately leads her to leave NCIS for good.

Advertisement

And if you like those, here are 10 more: “Dead Man Talking” (season one, episode 19); “SWAK” (season two, episode 22); “Bloodbath” (season three, episode 21); “Grace Period” (season four, episode 19”); “Requiem” (season five, episode seven); “Flesh And Blood” (season seven, episode 12); “A Man Walks Into A Bar” (season eight, episode 14); “Devil’s Triangle” (season nine, episode seven); “Squall” (season 10, episode 19); “Past, Present, Future” (season 11, episode 2)

Availability: The first 10 seasons of NCIS are available on DVD, as well as for digital purchase on iTunes and Amazon, and the three most recent episodes of season 11 available for viewing on CBS.com.

Advertisement

In two weeks: Just sit right back as Brandon Nowalk tells a tale about the 10 must-see episodes of Gilligan’s Island.