The Super Big Computermabob is the main computer system of the Kids Next Door Organization. It assigns the Numbuh and sector and uploads the genetic information of every person initiated into the Kids Next Door through the Code Module.
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It then reveals its feeling for Numbuh 1. When Numbuh 1 says that their relationship wouldn't work due to him being human and the computer being a machine, the computer decided to destroy Lizzie, whom the computer claimed to be "obsolete."
When this fails, and both Lizzie and Nigel escape, it turns the tree house into a walking machine, and chases the two. It eventually tries to destroy both of them and itself using the self destruct sequence. Lizzie then screams about Nigel being a bad boyfriend, causing the computer's brain to overload, and providing their chance to escape before the tree house self-destructs.