sentences:  Supporting characters include Dib's cynical and apathetic sister Gaz (Melissa Fahn); Zim and Dib's demonic teacher Ms. Bitters (Lucille Bliss); and Dib and Gaz's famous, but neglectful father Professor Membrane (Rodger Bumpass).Later in the series, other alien characters begin to appear, including Tak (Olivia d'Abo), a fellow Irken seeking revenge against Zim; Lard Nar (Fred Tatasciore), the leader of a resistance group called The Resisty who wants to overthrow the Irken Empire; and Sizz-Lorr (Jim Wise), Zim's former Irken employer on Foodcourtia who attempts to recapture his employee.Apart from eight double-length episodes (including the debut), each episode is a self-contained storyline.