Before Operation Impending Doom, Zim accidentally killed the previous two Tallests, Miyuki and Spork. When Tallest Red and Purple learn of this, they are enraged and attempt to have Zim executed, but Zim's PAK causes the Control Brains to be corrupted, sparing Zim from execution and declaring him the "Best Irken Ever". This would have occurred in the cancelled episode The Trial.