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Sensei Garmadon is the brother of Sensei Wu, the father of Lloyd, and the husband of Misako. He was formerly known as the evil Lord Garmadon due to being bitten by The Great Devourer as a child, and tried to possess all four of the Golden Elemental Weapons of Spinjitzu to turn all of Ninjago into his own evil image. He was later redeemed by his son Lloyd, The Golden Ninja during the Final Battle with The Overlord. After being restored to normal Garmadon became a sensei, and was against violence. Instead, he taught his students "The Art of the Silent Fist", a way of having one's opponent defeat themselves without having to use any weapon.
- In the TV series, Garmadon is voiced by Mark Oliver. In Lego Dimensions, Garmadon is voiced by Andre Sogliuzzo.
- In the level Elements of Surprise, Sensei Wu is seen with the ninjas rather than Sensei Garmadon.
- He's the second mentor to five of the six Ninjago Ninja (Kai, Cole, Zane, Jay, and Lloyd).