Great Wide Open is the fourth episode of NCIS Season 19 and the 418th episode of the entire NCIS series.
This episode also marks the final appearance of Mark Harmon (Leroy Jethro Gibbs) as a longest-running main cast member, as well as the final episode to feature Harmon and David McCallum (Ducky Mallard) together before McCallum’s death in September 2023.
Synopsis
Gibbs and McGee head to Alaska while the team works at home to uncover the conspiracy behind the serial killer with the case prompting Gibbs to make a life-changing decision.
Prologue
Act One
Act Two
Act Three
Gibbs and McGee on a boat on the lake.
Act Four
Act Five
Major Events
- Gibbs resigns from NCIS for good and also decides to stay in Alaska.
Trivia
- This is the final episode to feature Leroy Jethro Gibbs to date, excluding archive footage in The Stories We Leave Behind and A Thousand Yards in Season 21.
Cast
Series Regulars
| Name | Portrayed by | Role |
|---|---|---|
| Leroy Jethro Gibbs | Mark Harmon | Ex Special Agent Assigned to NCIS Major Case Response team. (Indefinitely Suspended) |
| Timothy McGee | Sean Murray | Senior Agent for the NCIS Major Case Response Team. Currently in charge. |
| Nicholas Torres | Wilmer Valderrama | Special Agent for the NCIS Major Case Response Team. |
| James Palmer | Brian Dietzen | Chief Medical Examiner for the Major Case Response Team. |
| Kasie Hines | Diona Reasonover | NCIS Forensic Specialist. |
| Jessica Knight | Katrina Law | NCIS Special Agent. |
| Donald Mallard | David McCallum | NCIS Historian. |
| Leon Vance | Rocky Carroll | NCIS Director. |
| Alden Parker | Gary Cole | FBI Special Agent. |
Recurring Cast
| Name | Portrayed by | Role |
| Marcie Warren | Pam Dawber | Journalist. |
| Phil Hanover | John Hensley | Husband of Jennifer. |
| Sonia Eberhart | Valarie Pettiford | CEO of Sonova. |
| Ramirez (Road to Nowhere) | Karina Noelle Castillo | Agent with the FBI. |
Other Cast
| Name | Portrayed by | Role |
| Tunu Alonak | Wayne Charles Baker | Alaskan fisherman. |
| Wayne Sweeney | Erik Passoja | FBI Deputy Director. |
| Melanie Stafford | Nikki McCauley | |
| Nina Bradshaw | Kimberly Christian |