Back when "Twin Peaks" season 1 was first airing, the biggest surprise for everyone was how much material the show was giving Sheryl Lee. Her character was Laura Palmer, introduced as a corpse in the pilot. Outside of a few minor flashbacks, the real Laura remains up to the viewer's imagination throughout the season, with us assuming her personality through the way her friends and family remember her.
It was a pretty standard, thankless "dead mystery girl" role for Lee, which is why she wasn't expecting to be called back after the first episode. In a 2016 interview Lee recalled:
"After we shot the pilot, I stayed in Seattle and kept doing theater. I thought that was it. Then David [Lynch] called me months later and said, 'How would you feel about moving to Los Angeles? I want to br