Related Information for Invader Zim Invader ZIM is/was a popular (though not by presumed target group or company executives) cartoon tv-show on Nickelodeon. It was created by Jhonen Vasquez (author, graphic artist and director) with music by Mark Totorici (opening title theme only) and Kevin Manthei (the rest).The main characters in the series were played by voice actors Richard Steven Horvitz (ZIM), Andy Berman (Dib), Rosearik Rikki Simons (GIR), Melissa Fahn (Gaz), Jhonen Vasquez (Computer), Rodger Bumpass (Professor Membrane),.. read more