Before production on the sequel, then titled "Star Wars: Chapter II", could begin, Lucas had to sort out various problems that had arisen. His special effects company, Industrial Light & Magic (ILM), no longer had any employees, as many of them had left to form Apogee and work on "Battlestar Galactica". "Galactica" became a "thorn in [Lucas's] side," as the project bore a strong resemblance to "Star Wars" to the point that production illustrator Ralph McQuarrie called it a "rip-off." Lucas hired some of the "Galactica" crew back, but had to replace others—most notably John Dykstra, with whom he'd had a hard time working on "Star Wars". Lucas had almost fired Dykstra during the production of the first film but did not because Dykstra had close friends on the crew, so Lucas also chose not to hire them back as well. One of Lucas's new hirees was Brian Johnson, who had worked on "" (1968) and turned down an opportunity to work on the first film. Lucas also had to build his studio, Lucasfilm, which similarly had few employees.