The "Valiant" and its crew are taken over by hostile alien life-forms which can control the minds of anyone they touch and Stormer, Rocka, and Breez must stop the ship from crashing into the Hero Factory in Makuhero City.
Armed with the power of Spinjitsu, Sensei Wu and his four ninja--Cole, Zane, Jay, and Kai--are up to the challenge when Samukai bets Garmadon that he can defeat Wu and his ninja, with both the world and the Underworld as the winner's prize.
The heroes of Hero Factory must find Core Hunter, an escaped prisoner, before he recovers the components of Doom Box, a super-weapon that can destroy an entire galaxy.