Lost tapes and new discoveries in a mysterious car crash that killed Karen Silkwood, a young mother. Silkwood's story fascinated generations, inspiring an Oscar®-nominated film starring Meryl Streep. Was it an accident or something more sinister?

With all the drama surrounding the blockbuster movie "It Ends with Us," "IMPACT x Nightline" takes a deep dive into the ongoing legal battle between co-stars Blake Lively and Justin Baldoni and their fight in the court of public opinion.