 Before Richard Steven Horvitz (qv) got the job,  Mark Hamill (I) (qv) and Billy West (II) (qv) were hired to  voice ZIM. At the time, Horvitz was doing the voice for Dagget on  _"Angry Beavers, The" (1997)_ (qv), and Nickelodeon didnt want the  same actor on two current shows. Hamill originally voiced ZIM for  the pilot episode. When Hamill was dropped, his parts were dubbed  over with Wests voice. The creators decided that both Hamill and  West were too well