|Game Only: This article belongs to games of the franchise and is non-canon to the main continuity.|
Fusion Tetrax has Tetrax's original series appearance but with orange eyes and fusion matter skin.
Fusion Tetrax was ordered by Fuse to create an army of Fusion Dinosaurs. Tetrax sensed that something wasn't right, so he sent the player to the Infected Zone to enter Fusion Tetrax's lair. The player had to defeat several Slag Cephlapods to clear the way to the lair. The player then confronted Fusion Tetrax and defeated him, earning a Humungousaur Nano.