Lego Ninjago: Masters Of Spinjitzu: Season 0, Episode 6

0 - 6: Battle Between Brothers

Zane finds Wu outside the Monastery in an ornate kimono. He tells Zane that it is a protective garment which he wore on the night Garmadon turned. There is then a flashback to when Wu finds his brother trying to steal the Weapons of Spinjitzu.