The Voltron Force travels to the peaceful planet Ariel to defend a race of lion-riding warriors from Sky Marshal Wade who is extracting a powerful metal ore called corite from their mines with Haggarium tipped drills. While playing their video game, the cadets are interrupted by a mysterious ally named Daigo asking for help from an impending danger with the Krelshi, Ariel's ancient lion protectors, and travel with the rest of the team on the mission.