Disclaimer: Zim belongs to Jhonen Vasquez, not me.
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An older model of an Irken personal vessel moved silently through space. A single Irken sat at the controls. He was relatively small, only slightly taller than Zim. His antennae were slightly longer than the average Irken's, and his eyes were a fierce blood red. This was Ked. Back in the academy, Ked had been fierce rivals with Zim. After a PAK malfunction had driven Ked to temporary insanity, he was banished from the Irken Empire and removed from the records. Ked, who had no memory of what had happened, blamed Zim for his exile and was determined to exact revenge.
Now, after training on Hobo 13 in preparation for his vengeance, Ked had at last traced Zim's location to a small backwater planet in a distant galaxy. As he neared the star system containing the planet Zim was stationed on, he grinned evilly to himself.
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Dib sat in his room, contemplating certain recent events. Ever since Zak left, not a single one of his infiltration attempts had succeeded. He needed something, anything, to give him an advantage against Zim.
Had he been looking out the window at the time, he would surely have noticed the streak of light across the night sky that was Ked's ship. As it was, he had no way of knowing that an old rival of Zim's was soon to arrive.
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Ked's ship flew over the city unnoticed. 'These pitiful life forms are completely idiotic' Ked thought as he scanned the area. He eventually came to a stop in the park, after finding a well-hidden cave to park his ship in. As he stepped out onto the ground, he chuckled evilly to himself. "Soon, Zim. Soon I will have my revenge." Ked let out an evil laugh strangely reminiscent of Zim's own.
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The next day, Ms. Bitters was off on another one of her famous doom rants. Zim was studying some blueprints for his latest plan, and Dib was in front of the class, once again trying to convince everyone that Zim was an alien.
"Come on, people! How is it that I'm still the only one to see Zim's an alien! I mean just look at him! He's got green skin and no ears or nose! His disguise is horrible!"
"Are you still going on about that?" asked Rob "He told you the day he got here that it's a skin condition."
Dib groaned and pulled on his hair spike. He was about to snap and go crazy again when Ms. Bitters shouted at him. "Dib! Sit down now!" As Dib went to sit down, Ms. Bitters addressed the rest of the class. "I just got off the phone with the principal, who has decided to bring in yet another new student. His name is…Ked."
Zim looked up from his blueprints at the mention of the new student's name. 'Ked…Why does that name sound so familiar?'
At that moment, the door opened and in walked a seemingly normal kid. His skin was slightly pale, his dark reddish-brown hair was neatly combed, and he wore a red shirt and black pants. He appeared strangely angry for someone who just arrived. His gaze instantly fell upon Zim. "I am Ked" he said. "Just stay away from me."
"All right, Ked, you'll need somewhere to sit." Ms. Bitters said. She looked around the room before she looked at Melvin, directly behind and next to Zim. "You! You're going to the underground classroom!" Melvin screamed as his desk dropped into the floor. The scream was instantly cut off as the desk rose back up empty. Ked immediately jumped to his seat and glared at Zim, who was watching Ked warily, still unable to shake that strange feeling of familiarity.