Hunk and Lance crash-land underwater and follow a mermaid to a civilization whose queen promises to keep them safe and help find the others. While resting, Lance is kidnapped by a trio of mer-people who believe the queen to be mind controlling the populous. After freeing Hunk of the control and capturing the queen do they realize that the Baku, which was a food source to the people, was really an alien predator beast. Lance channels a new weapon from his Blue Lion and kills the Baku, and as a thank you the queen uses the old energy beacon which brings Pidge to their rescue.
For millennia, the evil Galra Empire has plagued the universe by conquering planets and destroying their inhabitants. The only known threat to the empire's power and plans, is the legendary "Defender of the Universe" Voltron, a 100 meter tall robot warrior composed of five lion mechas whose whereabouts are presumed to be unknown. The Galra Empire's path of conquest and search for Voltron has led them to Earth's solar system. A group of space pilots-Shiro, Keith, Lance, Pidge, and Hunk-discover the blue lion and immediately get swept up into the Galran War. They meet Princess Allura, become the next Paladins, and reunite the five lions to form Voltron and free the universe from the Galra Empire.
**NOTE: Even though Netflix releases all episodes of Voltron: Legendary Defender on one day, they are portrayed on the TV Calendar as airing one episode a day, for ease of visualisation.
Voltron: Legendary Defender - The Depths Synopsis and Schedule