Disclaimer: Zim does not belong to me.
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That night, Dib was sitting at his computer at home, but was not paying any attention to it. He was still thinking about what had happened that day. Ked had thrown meat at Zim, and then had attacked him for seemingly no reason. Plus, Ked's hand had been steaming where he held the meat. Dib pondered the situation, the obvious conclusion evading him for some reason. Just then, Dib heard a scratching sound coming from his window. As he got up to investigate, the window smashed and Ked came crashing through. Needless to say, Dib was shocked, but he quickly got over it.
"Ked! What are you doing here? What do you want?" Dib asked in surprise.
Ked responded by leaning in close to Dib's face. "I couldn't help but notice that you and my nemesis hold each other with some disdain. I have this to say: Stay away from Zim! He is MINE to kill, understand? No one else!"
Dib glared at Ked. "All right, who are you? First you glare at Zim all day in class, then you attack him in the cafeteria, and now you're telling me that you alone have the right to kill him! I don't believe for a second you are who you pretend to be! Something's going on between you and Zim and I'm gonna find out what!"
Ked let out a low chuckle, which grew slowly into full-blown evil laughter. "Dib, was it? I must say, you are far more observant than the other filthy inhabitants of your miserable planet." Ked's holographic disguise faded away to reveal the real Ked. "Indeed you are right. Zim and I go back a long ways. He and I have been mortal enemies since before you even knew he existed. Zim is my enemy, and I am going to be the one to kill him, and I'll destroy anyone who stands in my way, including you if you continue to pose as competition to me!"
Dib continued to glare into Ked's blood-red eyes. "Look Ked, I don't know what Zim did to make you so mad at him, but now he's on my planet threatening my race. I have to stop him, for the sake of all mankind!"
Ked turned away. "I couldn't care less about the fate of your filthy race, Dib. As far as I'm concerned, you're just another obstacle standing in my way of finally destroying Zim, and I won't stand for it." Inconspicuously, Dib began to draw out the water gun he kept concealed in his coat – it had been meant for Zim, but now that he saw Ked was Irken (and, since he just got here, would have no defense against water), it would work just fine here. Unfortunately for Dib, Ked sensed what he was doing and whipped around, grabbing the gun right out of his hand. "Try it and I'll drop you where you stand" Ked growled, before snapping the plastic gun in two and throwing the pieces at Dib's feet. Ked climbed onto the windowsill, then turned back to look at Dib. "Remember this, human: Zim is mine, and I'll kill you without a second thought if you get in my way!" Ked's holographic disguise reappeared, then he leapt out the window and disappeared silently into the night, heading back to the cave he had stored his ship in.
Dib, meanwhile, was still standing in his room, shocked at Ked's viciousness, and at the seriousness of his tone. Then, it hit him that he'd just had an encounter with an alien right in his own room, and had failed to take any pictures. So he began banging his head against the wall, only to be answered with Prof. Membrane's voice calling out: "Son, stop thumping around up there! I need quiet to finish my latest creation!"
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Meanwhile, Zim was back at his base, still thinking about what had happened. Somehow, someway, Ked, his old rival from the academy, had returned. Not only that, but Ked had found his way to Earth, and was now intent on killing him. This was very different from Ked's usual style in the academy. When they were in training, Ked had simply been satisfied with Zim's humiliation, which he had achieved on a regular basis. Now, however, it seemed that Ked would stop at nothing less than Zim's utter destruction. Zim thought a moment, then called out: "GIR!"
"Yes my lord!" Gir shouted as he dropped in seemingly from nowhere, his normally cyan parts a brilliant red, indicating that he was in duty-mode.
"Gir we have a serious problem here. An old enemy of mine has tracked me to Earth, and I-"
"Dib?" Gir asked, fading back to normal.
"No. This enemy is far more dangerous than Dib."
"Tak?" asked Gir, tilting his head.
"I'm surprised you actually remember Tak, but no. It is my old archenemy from Invader academy, Ked. He is extremely dangerous and powerful, and he's out to destroy me. We have to do something about him, or the whole mission could be destroyed! You hear me? The whole mission!"
Gir spazzed out, making random noises that only he could make, before running off, only to slam headfirst into a wall.
Zim groaned. "Why did I think you would be any help?" he asked Gir's limp, unconcious body, before turning to the computer screen to formulate a plan for what to do about Ked.