7 Moments From "Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs elects to sit out the investigation in order to help Fornell.

"Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs elects to sit out the investigation in order to help a grief-stricken Fornell, (Joe Spano, pictured) whose life is on the verge of imploding following his wife's murder, on NCIS, Tuesday, Feb. 17 (8:00-9:00 PM, ET/PT), on the CBS Television Network. Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

"Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs elects to sit out the investigation in order to help a grief-stricken Fornell, whose life is on the verge of imploding following his wife's murder, on NCIS, Tuesday, Feb. 17 (8:00-9:00 PM, ET/PT), on the CBS Television Network. Pictured: Rocky Carroll Photo: Sonja Flemming/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

"Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs elects to sit out the investigation in order to help a grief-stricken Fornell, whose life is on the verge of imploding following his wife's murder, on NCIS, Tuesday, Feb. 17 (8:00-9:00 PM, ET/PT), on the CBS Television Network. Pictured: Michael Weatherly Photo: Sonja Flemming/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

"Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs elects to sit out the investigation in order to help a grief-stricken Fornell, whose life is on the verge of imploding following his wife's murder, on NCIS, Tuesday, Feb. 17 (8:00-9:00 PM, ET/PT), on the CBS Television Network. Pictured left to right: Rocky Carroll and Mark Harmon Photo: Sonja Flemming/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

"Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs elects to sit out the investigation in order to help a grief-stricken Fornell, whose life is on the verge of imploding following his wife's murder, on NCIS, Tuesday, Feb. 17 (8:00-9:00 PM, ET/PT), on the CBS Television Network. Pictured left to right: Sean Murray, Rocky Carroll, Michael Weatherly and Emily Wickersham Photo: Sonja Flemming/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

"Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs elects to sit out the investigation in order to help a grief-stricken Fornell, whose life is on the verge of imploding following his wife's murder, on NCIS, Tuesday, Feb. 17 (8:00-9:00 PM, ET/PT), on the CBS Television Network. Pictured left to right: Pauley Perrette, Emily Wickersham, Michael Weatherly and Rocky Carroll Photo: Sonja Flemming/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

"Cabin Fever" - NCIS S12 E15

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but Gibbs (Mark Harmon, left) elects to sit out the investigation in order to help a grief-stricken Fornell, (Joe Spano, right) whose life is on the verge of imploding following his wife's murder, on NCIS, Tuesday, Feb. 17 (8:00-9:00 PM, ET/PT), on the CBS Television Network. Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved