The "Water-Lightning" Dragon was created in when Jay and Nya were the only Ninja who weren't trapped in the Sword of Souls. After falling off the Misfortune's Keep, they weren't able to summon their own dragons for their battle with the Sky Pirates had weakened them. They came closer, and started holding hands, forming a fusion ball of water. The Hydro Electric Dragon had been created; Nya stated that water and electricity do mix, and Jay responded with a snicker.
LEGO Ninjago: Masters of Spinjitzu
Season 6: Skybound
- 61. "Wishmasters"