|Flain & Seismo Mix|
|Cartoon Appearances|| Calling All Mixels|
|Purpose||To defeat Nixels (Nixels)|
|Ability||Can create lava geysers by stomping his feet on the ground|
This Mix has the combined features of both Flain and Seismo. In this Mix, Flain's body is on the top, with two small horns coming from his head area. His mouth is different, as it is divided into two sections (the top, which is gold, and the bottom, which is dark gray). Also, at the lower part of Flain, he has body sections that are different from his natural ones, most notably at the very bottom. His neck is a darker shade of gray than his normal neck's shade, and he has Seismo's arms. The bottom area is identical to Seismo's legs and bottom body.
After fighting with a lone Nixel, Flain and Seismo find themselves cornered by a horde of Nixel reinforcements summoned by the lone Nixel. Seismo then pulls out an Infernite/Cragster cubit, but a Nixel knocks it out of Seismo's hand. Then, after being hit by a large horde of Nixels, they pounce after a Nixel holding the cubit, and fuse together to create this mix. The Mix then cheers for itself. Then, this Mix stomps the ground, creating lava geysers that hit the Nixels.
- He is often used as the headliner mix of the series. Due to this, he is one of the most popular of the Mixes.
- He features a LEGO version with instructions available on LEGO.com.
- Main article: Flain & Seismo Mix/Gallery