Koenig first became involved with writing a script for "The Animated Series" after he asked Susan Sackett, "Star Trek" creator Gene Roddenberry's assistant, to type up some writing he was working on. After reading it through, she thought it was good and passed it to Roddenberry, who agreed and asked Koenig if he was interested in writing for the animated show. He accepted the offer, and started working on a plot involving cloning which was inspired by newspaper articles about the subject, becoming the first actor from "Star Trek" to write for the franchise.