After the surprise success of 300, Legendary Pictures is developing a follow-up that Frank Miller is writing and Zack Snyder is interested in directing, according to Variety. It hasn't been announced whether or not the graphic novel that Miller is working on is going to be a prequel or a sequel and Snyder won't be fully committed until he digests Miller's take. The original 300 made $457 million worldwide. Frank Miller recently wrote and directed The Spirit, which stars Gabriel Macht, Scarlett Johansson and Samuel L. Jackson and is due in theatres October 8th.