Following the acquisition of Lucasfilm by The Walt Disney Company in 2012, a sequel trilogy went into production. "The Art of Star Wars: The Force Awakens", published in 2015, features the work of concept artists Iain McCaig and Craig Alzmann, production designer Rick Carter and Doug Chiang. The book contains early concept art tracing the early development of the character of Kylo Ren, and also reveals preliminary sketches that illustrate a proposed appearance of Anakin Skywalker as a malevolent "Force ghost".