Pandora’s lunch box
The Box of Legend. In Ancient Greece, Zeus, Poseidon and Hades decided to send down a 'mysterious box' down to a little girl, called Pandora. Upon seeing the box, Pandora's curiosity was piqued and she opened it, unwittingly unleashing all of the previously-imprisoned evils that had been contained within the box. Turned upon by her fellow men, Pandora, now cursed to wander the earth with no place to call home, had to now keep with her the box of legend, unable to open it herself.
Pandora sought revenge against both the people that spurned her and the gods that cursed her. To do this, she needed to open the box and unleash the contents upon them, but her 'curse' prohibits her from being able to open the very object from which her curse stems from and can grant her the revenge she craves. Forced to wander the earth, unable to open her 'lunchbox', Pandora, under the alias of "Dora, sought someone she can trick into opening the box for her.
Her chance finally came when she met Mandy at Endsville Elementary School. When they were out on the football field, Mandy wanted to destroy Mindy, her arch-nemesis. So she opens the lunchbox, unleashing evil that happened to be demons shaped like food. It turns out that Dora is actually Pandora, and she tricked Mandy into unleashing all of the demons. Mandy, angry that Dora tricked her, stops the end of the world by sucking the demons and Dora into the lunchbox (simply by closing the box and opening it again). Strangely enough however, Dora can still be seen in later episodes.