Both prequels and sequels to the main storyline. Additional or different Lost Boys appear in sequels, prequels and adaptations. Asimov would write two further sequel novels and two prequels. In 1999 Lucas launched the first of three prequels to the original "Star Wars" trilogy. Several novels, including an adaptation and prequels to the original story, have been published. It led to two direct-to-video prequels and one direct-to-video sequel. Lucas had minor roles in all three "Star Wars" prequels. Kiefer Sutherland has portrayed Jack Bauer in these episodes, including the "prequels" and the "webisodes". Lucas decided to focus on the "Star Wars" prequels instead. Lucas decided to focus on the "Star Wars" prequels. It was scripted and directed by Lal, who also wrote and directed the film's prequels. Fu was also responsible for designing General Grievous' concept art in the Star Wars prequels. The "Star Wars" prequels have generated a notably large interest in memes on Reddit. Casper Van Dien has made two cameo appearances in the Saban produced prequels. It is one of two prequels to the "Foundation" series.