Q&As About 'Star Wars': Was it Irvin Kershner who came up with the "Vader is Luke's father" plotline in The Empire Strikes Back?
Was it Irvin Kershner who came up with the "Vader is Luke's father" plotline in The Empire Strikes Back? No. It was George Lucas’s idea. Lawrence Kasdan incorporated Lucas’s concept into his draft of The Empire Strikes Back’s screenplay. Irvin Kershner did not have any say into how the screenplay was written. His job as a director was to interpret visually what Lucas and Kasdan wrote (in Courier font and proper screenplay format) on paper.