Mixels is an American animated television series that aired on Cartoon Network and was produced by The LEGO Group and Cartoon Network Studios. Following colorful creatures known as Mixels, the series depicts their exploits involving their ability to combine with one another in order to solve problems or fight against their enemy: the Nixels. The series first aired on February 12, 2014, with a new episode of Teen Titans Go!, and the series ran for two seasons, concluding on October 1, 2016.

Although previous Lego series, such as Lego Ninjago and Lego Legends of Chima, use CGI animation and are acquired by Cartoon Network, Mixels made use of Toon Boom Harmony software, animated at Atomic Cartoons, Inc., before later being animated traditionally at Digital eMation, Inc., Big Star Entertainment, Inc., and Saerom Animation, Inc. and is a Cartoon Network original. A mobile app was released for the series on March 4, 2014, named Calling All Mixels, and even earlier two websites, one on the LEGO website and another owned by Cartoon Network, were launched where fans can learn about the Mixels. Nine series of collectible Lego building toys were also released, based on the characters. On February 19, 2014, the series had begun airing as an interstitial program on Boomerang.

The TV series wrapped up production in July 2016, and the series finale aired on October 1, 2016.

Mixels is set in a fictional planet known as Planet Mixel, where the eponymous creatures live and engage in adventures across diverse lands. Mixels are split into twenty-four tribes based on fantasy elements or city occupations and have individual powers and traits based on these tribes. These creatures are capable of combining with one another to create temporary fusions known as a Mix (combinations of any Mixels), a Max (combinations of three Mixels from one tribe representing their element), or a Murp (uncontrollable combination of any Mixels), using an item known as a Cubit. Opposing the Mixels are the Nixels, led by figures Major Nixel and his boss, King Nixel, who live to tear apart the Mixels, get rid of the Cubits and hate color.

The series' first season follows different Mixels' escapades and differing points of view on how to solve certain problems, always resulting in a Mix. In the second season, the world is expanded as Mixels are revealed to be living on the moon. The city of Mixopolis is introduced: a metropolis housing new Mixel tribes and settings.

Lego Mixels (stylized as LEGO Mixels) was a Lego theme based on a variety of tribes living in a fantastical diverse world and are small creatures that can mix and combine with one another to create new characters. The theme was first introduced in 2014. It was eventually discontinued by the end of 2016.

The Lego Group handles all toy merchandise for the Mixels franchise, and Cartoon Network handles all non-toy merchandising. The Lego Mixels buildable collectible figurines went on sale on March 1, 2014. Each character has their own set, and nine were released as part of series one. For each tribe, one of the three sets contains a Nixel. Series 2 was released at the end of May, and Series 3 was released at the end of August. Series 4 was released on February 1, 2015.

Before Cartoon Network came to Lego, Mixels was called Monsters. It had sets of five in a tribe with overly simple designs. Some design changes include Shuff and Seismo's names being swapped with each other, Shuff having a looser crystal on his head that would have looked more like hair, Vulk's ears being red instead of black, the Nixels coming in various shapes, and Balk originally being shorter and squatter with thinner tentacles and smaller pupils. Kraw was originally named Bouncer, Gobba was Chippo, and Tentro was Flexi; other sources still slip up on Tentro and call him Flexi, though, including the Lego Magazine once.^{[citation needed]}