In Season 1, Episode 1 of Lego Ninjago, when we meet Lloyd Garmadon, he is wearing a skull hoodie with a green 5 on it. This is foreshadowing that he will become
LEGO Ninjago: Masters of Spinjitzu: Season 1, Episode 1 - Rotten Tomatoes
Ninjago: Masters of Spinjitzu" Rise of the Snakes (TV Episode 2011) - IMDb
LEGO Ninjago: Masters of Spinjitzu: Season 1, Episode 13 - Rotten Tomatoes