Mr. Pop was the Quillan equivalent to a mall here on earth, but it functioned more as a museum. It was a secret area hidden in a vast, complex underground system of abandoned malls. It contained books, paintings, maps, art, and as much of the history of Quillan that could be recovered.The "pop" part stands for population. It was hidden as a name because the territory-controlling company, Blok tried to get rid of the population's imagination by trying to erase all records of history, destroy all art, and make their own boring and lifeless art. It was planned to be released to the population of Quillan after Bobby Pendragon won the Grand X, but it was destroyed by Blok using an army of Dados armed with explosives, guns, and flamethrowers. Nevva Winter led the Dados to Mr.Pop using a tracking device.