15 Best Episodes Of NCIS From All 21 Seasons, Ranked

The 15 best episodes of NCIS across its 21 seasons comprise unique qualities that make them stand out. With an institutional presence on network television that spans over two decades, NCIS offers many episodes to choose from. Whether it’s stories driven by Mark Harmon’s Leroy Jethro Gibbs or developments under the leadership of former FBI agent Alden Parker, narratives wherein the cast of NCIS experience profound personal and professional development are the best.

It could take years to watch the entire NCIS series, so episodes that allow viewers to get to the hearts of the characters more quickly are instrumental. Before moving forward into NCIS season 22, indulging in bygone narratives can make the viewing experience all the more complex. Whether watching NCIS for the first time or the umpteenth time, these episodes are sure to stand out.

“SWAK” is one of the best episodes of NCIS because it’s a harrowing episode for Tony. When Tony opens an envelope delivered to him at NCIS Headquarters that was “SWAK” or “sealed with a kiss,”Tony inhales an unknown bioweapon. Testing ultimately revealed the substance to be bubonic plague, and it’s uncertain whether Tony will survive.