ESPN has shared the first look at its upcoming "30 for 30" documentary on disgraced cyclist Lance Armstrong.

The trailer for the two-part series, titled "LANCE," features Armstrong mulling a question about "the worst thing" he did and concludes with him vowing to tell his "truth."

"LANCE" will document Armstrong's rise to global superstardom, his battle with testicular cancer, and the doping scandal that led to him losing his seven Tour de France titles. It includes interviews with Armstrong, family members, teammates, friends, rivals, and journalists.

Part 1 of the series will premiere May 24 at 9 p.m. ET followed by the second installment on May 31 at 9 p.m. ET.