Voltron is the giant robot created from the combination of all five Voltron Lions. It has been ten thousand years since it was last formed, and its return is brought about when Shiro returns to Earth a year after his capture by the Galra Empire, drawing Keith, Lance, Hunk, and Pidge together to locate the Blue Lion and use it to find the Castle of Lions on Arus. They reawaken its sleeping inhabitants, Princess Allura and Coran, and the last Alteans help locate the subsequent Lions to form Voltron and defend against Sendak.
Defender of the universe, first formed 10,000 years ago to protect the galaxy from evil. A mighty warrior standing at over 100 meters tall and assembled from five robot lions, Voltron inflicts colossal blows, leaps staggering distances, and wields an arsenal of lasers, sabers, missiles, and the invincible blazing sword.
Not much is known of the origins of Voltron. It was used ten thousand years ago by King Alfor when the Alteans held an alliance with the Galra Empire, as Zarkon was the Black Paladin. However, Zarkon sought to have the power of Voltron for himself and betrayed Alfor and his people, mercilessly attacking them with the might of the Galra Empire. This led King Alfor to put Allura and Coran in a deep sleep inside cryo-pods within the Castle of Lions, and to scatter the Voltron Lions to hidden locations across the universe so they would not fall into Zarkon's hands. Alfor met his end by unknown means, and the Altean race was destroyed along with planet Altea.
Each Voltron Lion comprises a part of Voltron, and each pilot of a Lion is called a Paladin. The Lions and Paladins are color-coded to match each other. When formed as Voltron, the Paladins pilot the giant robot in unison. The Lions and known Paladins are as follows:
- Black Lion: Forms the head and torso.
- Red Lion: Forms the right arm.
- Green Lion: Forms the left arm.
- Yellow Lion: Forms the left leg.
- Blue Lion: Forms the right leg.
- In the original Japanese anime Beast King GoLion, Voltron was called GoLion.