Zim slowly steeped forward on the ledge, one black clad foot in front of the other, holding his arms out to stay balanced. From his position, he could see the top of the Membrane Labs Headquarters. Zim knew from personal experience that the building was surrounded by a 300-watt electric force field at all times, and that it was impossible to get inside unless one of the Membrane's wanted you to. For a second, Zim imagined how much better off he would've been if Proffeser Membrane never had any children. Or if Membrane had never existed. Zim narrowed his eyes and looked away from the building to concentrate on his next step.
Really, he should have seen it coming. The way Dib kept detailed observations and ran experiments to try to capture him showed signs of a scientific mind. It was in his genes, and quite literally it was what he was made for. Zim frowned at the thought of his once enemy. Dib. After becoming a succesful scientists, he had become insanely famous. His face was plastered everywhere. And no matter how much Zim tried to avoid him he couldn't. Zim hated him for that.
Subconsiously Zim tensed as he heard a rustling sound coming from behind him. He turned his head slightly towards the sound. Just a crumpled piece of paper the wind had disturbed. Zim dismissively turned away and let his shoulders relax. For a while he had let himself hope that each strange sound he heard was Dib, coming back to tell him he wouldn't rest until Zim was under the government's custody. That hope had died down a long time ago, when he realized Dib didn't need him anymore. All his life all Dib wanted was to be accepted by his own race. For years he chased after Zim fervently, thinking that if he could just convince everyone of the alien's existence they wouldn't think he was crazy. That was until Dib realized his true calling, science. Hopes of finally capturing Zim were replaced by dreams of finding the cure for the common cold, or a drug that helped you live longer. Zim couldn't believe that Dib had left him behind in favor of following the footsteps of his father. To Zim, it was something thst couldn't be forgiven. He didn't deserve to be treated that way. What made Dib think he could leave Invader Zim behind? Didn't he care about how he felt? Zim zmirked. Of course he didn't. Because he was a terrible, good for nothing, pitiful, dirty rotten human. And he was going to pay.