Two years ago, Gimlet launched its first fiction podcast: Homecoming. Now, this November, a television series based on the hit podcast and starring Julia Roberts is launching.  Alex Blumberg went behind the scenes as Homecoming went from podcast to TV production. In this first episode, Homecoming creators Eli Horowitz and Micah Bloomberg recount the journey, from concept to podcast to pitching the show to bigtime Hollywood producers. And we hear from some of the celebrities they met along the way.This is the first part of a four-part mini-series on the making of the Homecoming TV show.