Five Earth teens - Keith, Lance, Hunk, Pidge and Shiro - who become the last line of defense for the galaxy in an intergalactic battle against the evil alien force led by King Zarkon....
Following on from the sacrifice of the Castle of Lions, the Paladins and their allies need to figure out a way to recharge the Lions after their battle with Lotor, and a way back to home....
As the team tries to decipher Lotor's plan for the comet, Coran gives the Paladins a history lesson about the origins of Voltron and the ongoing war....