After Voltron's victory over Lotor and his army, the Robot Lions lost control during a celebratory event and nearly destroyed a city. Because of this, Galaxy Alliance commander Sky Marshall Wade ordered the Lions to be dismissed from their duty as defenders of the universe and disbanded the Voltron Force. Since that day only the Galaxy Alliance has been in charge of protecting the universe while Lance, Pidge, and Hunk are acting officers in the army, Princess Allura is ruling her home planet Arus, and Keith is a fugitive from the Alliance. Daniel is a mischievous and ...
Daniel and Vince arrive at the Castle of Lions and meet a fellow Cadet named Larmina, who is revealed to be Princess Allura's niece and the trio are given their "Voltcoms", special gauntlets that access special abilities within them and will allow them in the future to pilot the Lions. As Pidge and Hunk go to rescue Keith from drifting into space (due to the fact that Wade's experiments on Black Lion have left it barely with any power), Kala, a Drule commander/strategist, and Maahox, a scientist, succeed in bringing Lotor back to life. They explain how long he has ...
After the previous events, Wade goes insane and kidnaps the Alliance and replaces its soldiers with robots, while additionally holding Coran hostage. Meanwhile Lotor and Maahox plot to send a new Robeast to Arus to destroy Voltron as it is powered by a combination of Kala, the Drule commander that Maahox terminated and Haggarium, the substance that Kala's energy apparently stabilized and was used to resurrect Lotor. As the Lions fight the Kala Spider Robeast (with Daniel piloting the Red Lion along with Lance due to an injury he sustained), Keith and Larmina fend off ...
When Pidge shows off the new tail-weapon upgrades, the Voltron Force receives a distress call from Coran who warns them of a moon-base factory on Tarvos that will be manufacturing an invincible army for Sky Marshall Wade. But when they try to rescue him, they fall into a trap set by Wade as the real Coran is trapped inside and must search for him while battling Wade's own experimental versions of the Lions. Meanwhile, the cadets soon learn it's a Coran imposter that's actually a robot strapped with a time bomb and must face it in a fight.
When the cadets grow impatient with their lack of flight hours in the Lions, Daniel convinces the group to borrow the Lions so they can sneak off to go to Planet Doom, Lotor's home planet to grab a sample of Haggarium. But they soon find themselves abducted by Maahox, who studies Vince's strange energy signature. Meanwhile, Lotor invades the Castle of Lions and takes Allura hostage, and Voltron debuts a new reconfiguration ability during the rescue; Lance's red-center form for Voltron with "Magma Pistols".
Hunk takes the cadets on a bonding mission to his secret junkyard called The Hunkyard to learn teamwork and to build "crush cars" so they can have their own vehicles. However, cadet bonding day comes to a halt when an army of Waderoids powered by Haggarium attack them and form together to make a massive scrap monster out of junk. When the rest of the Voltron Force arrives, they take the beast down by taking on a new form that makes Yellow Lion the body and head of Voltron and forms "Rock Wrecking Maces" as his battle weapon.