Highlights from the Twenty Fourth Episode of Season 4 of NCIS: LA

A nuclear explosion in the Pacific reignites the search for stolen nuclear weapons.

"Descent" Episode 24 of Season 4

Pictured (L-R): Massi Furlan (Mikhail Andros), LL COOL J (Special Agent Sam Hanna), Timothy V. Murphy (Isaak Sidorov) and Pasha Lychnikoff (Michael Zhrov). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured: LL COOL J (Special Agent Sam Hanna). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Sonja Flemming/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured (L-R): Natasha Alam (Veronica Pisconov), Timothy V. Murphy (Isaak Sidorov) and Aunjanue Ellis (Michelle Hanna). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Sonja Flemming/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured: Chris O'Donnell (Special Agent G. Callen). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Sonja Flemming/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured (L-R): Kym Jackson, Aunjanue Ellis (Michelle Hanna), Natasha Alam (Veronica Pisconov) and Timothy V. Murphy (Isaak Sidorov). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured (L-R): Aunjanue Ellis (Michelle Hanna) and Timothy V. Murphy (Isaak Sidorov). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured (L-R): Aunjanue Ellis (Michelle Hanna) and Timothy V. Murphy (Isaak Sidorov). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured (L-R): Eric Christian Olsen (LAPD Liaison Marty Deeks) and Daniela Ruah (Special Agent Kensi Blye). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured: Daniela Ruah (Special Agent Kensi Blye). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured (L-R): Eric Christian Olsen (LAPD Liaison Marty Deeks) and Daniela Ruah (Special Agent Kensi Blye). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured: Aunjanue Ellis (Michelle Hanna/Quinn) and LL COOL J (Special Agent Sam Hanna) and Timothy V. Murphy (Isaak Sidorov) (second from the left). A nuclear explosion in the Pacific reignites the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and leaving Sam and Deeks teamed up state side, on the season finale of NCIS: LOS ANGELES, Tuesday, May 13 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured: LL COOL J (Special Agent Sam Hanna). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.

"Descent" Episode 24 of Season 4

Pictured: Daniela Ruah (Special Agent Kensi Blye) and Eric Christian Olsen (LAPD Liaison Marty Deeks). An explosion in the desert rekindles the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and Sam and Deeks teamed up stateside, on the fourth season finale of NCIS: LOS ANGELES, Tuesday, May 14 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Aunjanue Ellis as Michelle Hanna, Christopher Lambert as Marcel Janvier and Timothy V. Murphy as Isaak Sidorov. Photo: Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.