Casting DS9 with Larry Nemecek, Part 2. Choosing the actors who will bring new characters to life is one of the many creative challenges in launching a new Star Trek series. The process itself can change the nature of the roles, resulting in adjustments to name, the background story of a given character, and their relationship with others. In this episode of The Orb we bring you the second part of our two-part conversation with Larry Nemecek about the casting of Deep Space Nine and the evolution of the characters.