THE SEARCHERS

Emotional Reunion of Father and His Long-Lost Twins, More Than 40 Years in the Making, Airing on '20/20,' Friday, May 26, on ABC

It was a story that seemed to capture the world. U.S. Army veteran Allen Thomas reached out on social media for help finding his twins, who disappeared from his life in Korea nearly half a century ago. His simple plea on Facebook: "My name is Allen Thomas, and I am looking for my son and daughter... I have been searching for decades... " generated an immediate and overwhelming worldwide response. Yet after over one million shares, Thomas was no closer to solving the mystery of what happened to his son and daughter, born to his ex-wife. That is when "20/20" teamed up with investigative genealogist Pamela Slaton to work with Thomas and his daughter Charlene on their emotional quest. From Korea to Washington State to our nation's heartland, "20/20" follows the twists and turns that end with a miraculous reunion more than 40 years in the making.

Elizabeth Vargas' report airs on "20/20," on FRIDAY, MAY 26 (10:01-11:00 p.m. EDT) on ABC. (Rebroadcast ABC OAD: 12/11/15)

"20/20" is anchored by Elizabeth Vargas and David Muir. David Sloan is senior executive producer.