The cast of Star Wars: The Empire Strikes Back did a series of interviews promoting the film, and the video is pretty revealing. The best part: Mark Hamill discusses speculation that his son Nathan could play a young Luke Skywalker in the Star Wars prequels. According to Hamill, the prequels would take place 20 years before the original Star Wars, and the third movie would feature "an eight-year-old Luke playing in the background." Also: Harrison Ford discusses whether Han Solo would appear in episodes seven, eight and nine. [Vimeo, via The Official Star Wars Blog]