Gazlene "Gaz" Membrane (voiced by Melissa Fahn) is Dib's younger sister who enjoys playing video games, drinking soda and eating pizza, particularly from her favorite restaurant Bloaty's Pizza Hog (a pastiche of ShowBiz Pizza Place and Chuck E. Cheese's). If and when someone or something stands in the way of her getting those things, she is extremely vengeful and quick to lose her temper. Like her brother, Gaz knows that Zim is an alien, but does not care because she believes he is incapable of conquering the Earth. Gaz very rarely displays happiness, and is usually humorless and ill-tempered. However, she is sometimes amused at Zim and Dib's misfortunes.