Initially, Shego was meant to be Dr. Drakken's sidekick, designed with green and black - colors the creators considered to be known as "bad colors". However, after hearing Nicole Sullivan's performance as Shego they started to develop her unique relationship with Drakken, as Nicole portrayed Shego as sarcastic and more intelligent than Drakken. This prevailed throughout the series as her trademark. The characters' voice actors had already worked together in "Buzz Lightyear of Star Command". Originally, Shego was not included in the initial version of the pilot episode ("Crush") of "Kim Possible", but was added in later versions of it.