The BEST episodes of 20/20 season 41

#1 - Inside the Rule of North Korean Leader Kim Jong Un

Season 41 - Episode 4 - Aired 1/12/2018

North Korean leader Kim Jong Un and his fractured family's 70-year dynastic rule; interviews with those who knew Kim Jong Un and his assassinated half-brother.

#2 - American Royal

Season 41 - Episode 1 - Aired 12/1/2017

Meghan Markle's teachers recall her compassion for people on the 'margins of society'

#3 - Toxic Love

Season 41 - Episode 15 - Aired 3/30/2018

#4 - House of Horrors

Season 41 - Episode 6 - Aired 1/19/2018

13 Siblings Allegedly Held Captive at Home by Parents; The Turpin Children's Aunt Describes Living With The Family; What 'Wolfpack' Mom, Brothers Would Say to Turpin Children; Where Siblings Allegedly Held Captive Are Today

#5 - Slender Man

Season 41 - Episode 7 - Aired 2/2/2018

Slender Man stabbing: Parents recall what happened that morning; 12-year-old survives being stabbed 19 times by her friends; What is Slender Man, the figure that motivated two girls to stab their friend

#6 - NXIVM Expose

Season 41 - Episode 2 - Aired 12/15/2017

20/20' INVESTIGATES SELF-PROCLAIMED PROFESSIONAL COACHING COMPANY NXIVM AND INTERVIEWS FORMER MEMBER WHO CLAIMS SHE WAS BRANDED DURING INITIATION INTO SECRET SOCIETY ASSOCIATED WITH THE ORGANIZATION.

#7 - The Story of Gypsy Blanchard

Season 41 - Episode 3 - Aired 1/5/2018

Mom says daughter suffered from illnesses and needed wheelchair, feeding tube; Gypsy Blanchard on what happened the night mom was stabbed to death; Man says he feels ex-girlfriend used him to kill her mom

#8 - Stranger than Fiction

Season 41 - Episode 14 - Aired 3/23/2018

#9 - James Comey

Season 41 - Episode 18 - Aired 4/15/2018

The event America's been waiting for - James Comey - his first interview since being fired by President Trump.

#10 - Undercover Mother

Season 41 - Episode 16 - Aired 4/6/2018

A mother opens up about her fight to prove her son is innocent of murdering a 19-year-old college student.

#11 - Triumph in Thailand

Season 41 - Episode 30 - Aired 7/7/2018

#12 - Buried Secrets

Season 41 - Episode 31 - Aired 7/13/2018

#13 - Thailand Cave Rescue

Season 41 - Episode 33 - Aired 7/27/2018

Two Thailand rescuers detail the perilous moments.

#14 - What Happened to Abby

Season 41 - Episode 38 - Aired 9/7/2018

Abby Hernandez was just 14 years old when she vanished without a trace while walking home from her school in North Conway, New Hampshire, on Oct. 9, 2013. For nine months, Abby’s disappearance left her family, investigators and the community mystified. The search for the teen was one of the largest in the state’s history. Rumors and theories percolated through the northern New Hampshire town about what may have happened to the teen, who had just begun her freshman year at Kennett High School.

#15 - Family Secrets

Season 41 - Episode 28 - Aired 6/22/2018

A daughter fights for justice after her mother was allegedly killed in husband's murder-for-hire plot.

#16 - Hypnosis, Memory & Mystery.

Season 41 - Episode 27 - Aired 6/15/2018

Mom discovers daughter brutally attacked by man with shovel; Attack survivor undergoes hypnosis to remember details about assault; DNA match links man to near-fatal shovel attack

#17 - Nerves of Steel

Season 41 - Episode 22 - Aired 5/11/2018

A midflight explosion forces pilot Tammie Jo Shults to make an emergency landing in Philadelphia; interviews with passengers on the flight and those that know the heroic pilot.

#18 - NXIVM

Season 41 - Episode 20 - Aired 4/27/2018

Former members of NXIVM, a professional coaching company, speak out about their experiences in the alleged secret society; the alleged sex-trafficking charges against actress and NXIVM member Allison Mack; NXIVM's litigation tactics against critics.

#19 - To Catch a Killer

Season 41 - Episode 21 - Aired 5/4/2018

Authorities use DNA to find Joseph DeAngelo, the suspected Golden State Killer; interviews with attack survivors and others close to the case.

#20 - Murder at the Mansion

Season 41 - Episode 11 - Aired 3/2/2018

Woman dies mysteriously in historic California mansion; Dead woman's family refuses to believe she committed suicide; Nearly seven years after mysterious death, civil trial begins

#21 - Sister Survivors

Season 41 - Episode 5 - Aired 1/18/2018

'Army of survivors' break their silence at Nassar sentencing; Larry Nassar defends himself in court; The repercussions from Nassar sexual abuse case

#22 - Murder by Kayak

Season 41 - Episode 9 - Aired 2/16/2018

"20/20" features first television interview with Angelika Graswald, who pleaded guilty in the case of her fiance's death while kayaking on the Hudson River, after being released from prison.

#23 - Forgiving a Killer

Season 41 - Episode 10 - Aired 2/23/2018

Man recalls last hours before son, wife were shot and killed; Dad survives son's murder plot that killed mom and brother; Son becomes prime suspect in mom, brother's murders

#24 - My Reality: A Hidden America

Season 41 - Episode 19 - Aired 4/20/2018

Sexual harassment in the workplace and potential solutions.

#25 - John McCain: Remembering A Maverick

Season 41 - Episode 37 - Aired 8/25/2018

John McCain, a devout maverick, dies at 81; John McCain on the horrors he endured as a POW; John McCain's colleagues, friends reflect on his legacy