Michael David Adamthwaite (born September 1, 1981) is a Canadian voice actor. He is best known for providing the voice of Jay. He also voices Mezmo, Fang-Suei, Bolobo, Postman, Bizarro Jay, Min-Droid, the Magician (Episode 28), the News Reporter, Tai-D, Wrayth, Squiffy, Raggmunk, Luke Cunningham, Skullbreaker, Vlad Tutu, the Admin Droid, the Skull of Hazza D'ur, and Murt in the LEGO Ninjago: Masters of Spinjitzu.
- His other voice acting credentials include Fantastic Four: World's Greatest Heroes (Namor), Mobile Suit Gundam 00 (Narrator, Emilio, and Ribbons Almark), Next Avengers: Heroes of Tomorrow (Thor), X-Men: Evolution (Colossus), War for the Planet of the Apes (Luca) and Super Noobs (Zenblock and Jock).
- He is one of seven of the show's voice actors with the first name of "Michael" and the seventh overall, with the other six being Michael Dobson, Michael Kopsa, Michael Antonakos, Michael Daingerfield, Michael Donovan, and Michael Peña.
- He appeared in The Twilight Saga: New Moon as Chet.
- He also had a minor role in Roald Dahl's: The BFG as The Butcher Boy and a London citizen.
- He voices two Serpentine; Mezmo and Fang-Suei.
- He voices many different villain factions- Serpentine, Nindroids, Ghost Warriors, Sky Pirates, Vermillion, Sons of Garmadon, and Dragon Hunters.
- His favorite ninja suit is the ZX gi featured mainly in Season 1: Rise of the Snakes and Season 2: Legacy of the Green Ninja.
- He, along with Adrian Petriw, Vincent Tong, Mackenzie Gray, Dean Redman, Ashleigh Ball, Michael Daingerfield, Michael Dobson, Brian Drummond, Andrew Francis, Michael Kopsa, Richard Newman, Mark Oliver, Tabitha St. Germain, and Lee Tockar voiced characters in Iron Man: Armor Adventures.