In the world called "LittleBigPlanet" made by Creator Curator,the Sinister Collector is stealing characters and their creations. Later,Sackboy explores the Gardens,learning some tools. The King appeared and tells him that the creations are stolen.
At the Collector's lair,He receives contact from Negativitron,who will be announcing once the Collector is done. While Sackboy travels,He meets Larry Da Vinci,who tells him that Negativitron came from the Interdimension and start to suck up the world's inhabitants.
Sackboy begun training with Avalon Centrifuge to learn combat using machines. They Journey to form an alliance with Victoria Von Bathysphere,Clive Handforth,Eve Silva Paragorica,and Higginbotham.
Later,They're being attacked by a Huge Machine. Sackboy manage to destroy,but not before the collector abducts the Alliance.
Sackboy arrives at the Collector's Lair where the Negativitron betrayed the Collector and begun sucking all the characters & creations. Sackboy manage to free the Alliance and work together to stop Negativitron. After the Collector reveals Negativitron's weakness,Sackboy and the Alliance manage to destroy the brain,killing him and releasing all of the characters and creations back.
As the Alliance congratulates Sackboy,The Collector reveals that he doesn't because he has no friends. The King appeared and suggests that all the LittleBigPlanet Community can be his friends. The Heroes decides to return home.