Keith, Lance, Hunk, Pidge and Princess Alura have finally launched a successful assault on Planet Doom and destroyed King Zarkon s arsenal. In response, Zarkon calls upon all his evil allies in the empire. The undefeated warrior Stride is bound to answer this call by an ancient oath, even though he is an honorable man. The most dangerous new arrival is Queen Merla, who is as cruel as she is beautiful. With her psychic powers and strategic talent, the Voltron Force s only hope is to convince her to switch sides. Meanwhile, Galaxy Garrison prepares a massive counterstrike against the Druel Empire with the help of all the Alliance planets. Zarkon and his new allies stage a raid on their headquarters during the Alliance meeting, forcing Voltron into a life or death struggle with Galaxy Garrison as the backdrop!