Mezmo is a minor antagonist in LEGO Ninjago: Masters of Spinjitzu. He is the soldier of the Hypnobrai tribe, and the Judge of the Slither Pit. He is the only other Hypnobrai who thinks Slithraa's plans are ridiculous, the other being Skales.
Rise of the Snakes
Mezmo and Skales are talking at the end of the episode, on how to end the ridiculous plans of Slithraa.
Mezmo serves as the judge of the Slither Pit, and is happy to have a more serious General when Skales wins.