 During the pouring rain , a mother and father leave a heavily chained toy box at the doorstep of Foster 's Home for Imaginary Friends with instructions to not be opened . The next day , Frankie has grown outraged about her job as the house caretaker ; Mr. Herriman has been giving her endless chores to take care day after day without thanking her for any of it . When Frankie discovers the box left on the doorstep , Herriman instructs her to leave it in the attic . In a fit of anger toward Herriman , she intentionally ignores the instructions given in the box and peeks inside it . She falls inside , only to discover it is a vast world filled with anthropomorphic toys and delectable treats . She hears and sympathizes with a young boy 's voice ( Max Burkholder ) , later revealed to be the imaginary friend named World ( given the name by the crew of the show ) , who has been living alone in the toy chest since his family left the box at Foster 's . 
