Atomic Cartoons Inc. is a Canadian animation company, based in Vancouver, founded in 1999 by Trevor Bentley, Mauro Casalese, Rob Simmons and Emmy Award winner Rob Davies. Prior to A Quest for the Lost Mixamajig, they did the animation for Mixels, using Toon Boom Harmony software. However, it is commonly mistaken that the series (during its time at Atomic Cartoons) was animated in Adobe Flash. They were the only North American animation studio to work with the series, as other studios that worked with the series are instead based in South Korea.
- They have had the longest run of all the animation companies, animating all of Season 1 and Mixel Moon Madness. They are also the only company to animate more than one episode.