Mark Harmon as Gibbs wearing a navy blue NCIS hat and jacket

Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs.

Photo: Sonja Flemming/CBS

Test your NCIS IQ by filling in the blanks of Gibbs' Rules.

NCIS Special Agent Leroy Jethro Gibbs (Mark Harmon) lives by an extensive list of guidelines, appropriately called "Gibbs' Rules." Rule No. 11? "When the job is done, walk away." And that's exactly what happened at the end of the Oct. 11 episode of NCIS, "Great Wide Open."

After 18 seasons, Harmon ended his impressive run as a series regular—as his onscreen counterpart gave up his badge to stick around in Alaska indefinitely. But fans of the long-running procedural need not fret. In a statement about the series star's departure, NCIS EP/showrunner Steve Binder had this to say regarding Harmon's future: "As longtime fans of the show may have noticed over the years … never count Leroy Jethro Gibbs out."

So, how well do you know Gibbs? Take our quiz and find out!


Watch NCIS on Mondays at 9 PM, ET/PT on CBS and streaming on Paramount+.

SUBSCRIBE NOW: Enjoy 4 Digital Plus 2 Print/Digital Issues Of Watch Per Year — For Free!


Rule No. 1: Never let _____ sit together.

Mark Harmon as Gibbs with Cote de Pablo as Ziva David and Wilmer Valderrama as Nick Torres

Mark Harmon as Gibbs, Cote de Pablo as Ziva David, and Wilmer Valderrama as Nick Torres.

Photo: Bill lnoshita/CBS

A) Criminals
B) Ex-wives
C) Suspects
D) Lawyers

*Answer to Rule No. 1 below the next photo

Rule No. 2: Always wear ______ at a crime scene.

Gibbs uses a flashlight to read a file

When an attempted robbery leaves a lieutenant dead and the city without power, the team must figure out what happened through old-fashioned methods.

Photo: Eric McCandless/CBS

(ANSWER to Rule No. 1: C. Suspects—"Never let suspects sit together.")

A) A bunny suit
B) A mask
C) A badge
D) Gloves

*Answer to Rule No. 2 below the next photo

Rule No. 7: Always be ________ when you lie.

Gibbs inspects evidence near a dead body at a crime scene

Gibbs inspects evidence at a crime scene.

Photo: Ron Jaffe/CBS

(ANSWER to Rule No. 2: D. Gloves—"Always wear gloves at a crime scene.")

A) Confident
B) Honest
C) Specific
D) Brief

*Answer to Rule No. 7 below the next photo

Rule No. 9: Never go anywhere without ___________.

Gibbs and Emily Wickersham as Special Agent Bishop venture into a darkened room using flashlights to light the way

Gibbs and Emily Wickersham as NCIS Special Agent Eleanor "Ellie" Bishop venture into a darkened room.

Photo: Eddy Chen/CBS

(ANSWER to Rule No. 7: C. Specific—"Always be specific when you lie.")

A) A gun
B) A knife
C) A partner
D) A smartphone

*Answer to Rule No. 9 below the next photo

Rule No. 23: Never mess with a Marine's __________ if you want to live.

Gibbs puts a finger to his lips to shush Pam Dawber as investigative journalist Marcie Warren

Gibbs gives investigative journalist Marcie Warren (Pam Dawber) a shush sign.

Photo: Cliff Lipson/CBS

(ANSWER to Rule No. 9: B. A knife—"Never go anywhere without a knife.")

A) Boat
B) Gun
C) Coffee
D) Team

*Answer to Rule No. 23 below the next photo

Rule No. 39: There's no such thing as a ________________.

Gibbs wearing a long coat and holding a cup of coffee

The coffee-obsessed Gibbs.

Photo: Bill Inoshita/CBS

(ANSWER to Rule No. 23: C. Coffee—"Never mess with a Marine's coffee if you want to live.")

A) Second Chance
B) Gut Instinct
C) Frame-up
D) Coincidence

*Answer to Rule No. 39 below the next photo

Rule No. 42: Never accept an apology from someone who just ________________.

Gibbs takes notes as he talks to medical examiner Dr. Donald "Ducky" Mallard

Gibbs takes notes during a conversation with medical examiner Dr. Donald "Ducky" Mallard (David McCallum).

Photo: Patrick McElhenney/CBS

(ANSWER to Rule No. 39: D. Coincidence—"There's no such thing as a coincidence.")

A) Ignored the evidence
B) Sucker-punched you
C) Audited you
D) Bypassed the chain of command

*Answer to Rule No. 42 below the next photo

Rule No. 62: Always give people space when they get off _______ .

Gibbs wearing a baseball cap and holding a notepad and a pen

Gibbs with his trusty notepad and pen.

Photo: Cliff Lipson/CBS

(ANSWER to Rule No. 42: B. Sucker-punched you—"Never accept an apology from someone who just sucker-punched you.")

A) A case
B) An elevator
C) An airplane
D) A bender

*Answer to Rule No. 2 below the next photo

Rule No. 73: Never meet your ______________.

Gibbs looking dapper in a jacket and tie

Gibbs looking dapper in a jacket and tie.

Photo: Erik Voake/CBS

(ANSWER to Rule No. 62: B. An elevator—"Always give people space when they get off an elevator.")

A) Heroes
B) Enemies
C) Exes
D) Competition

*Answer to Rule No. 73 below the next photo

Great Wide Open

(ANSWER to Rule No. 73: A. Heroes—"Never meet your heroes.")

How did you do? Ready for duty with a 9 out of 9 score? We hope so, because you know Gibbs would expect no less.

Watch NCIS on Mondays at 9 PM, ET/PT on CBS and streaming on Paramount+.

SUBSCRIBE NOW: Enjoy 4 Digital Plus 2 Print/Digital Issues Of Watch Per Year — For Free!

MOST POPULAR

Trending