After fighting against a considerable amount of robot zombies, Max asks to Steel if he could develop some kind of protector to to their brains to prevent the horde from eating their brainwaves. The alien quickly analyzes a robot zombie and starts developing a brain shield while Max and his team goes to Mortum's hideout.
There, after Max's team is overpowered by Mortum's Turbo Trap Mode and are restrained while he eats their brain energy, Steel creates the brain shields and stop Mortum's feast.
In the Rayne Martinez's aunt's house, Alex is attacked by a robot zombie but his brainwaves are not eaten. Max realizes that Steel must have completed the brain shields and C.Y.T.R.O. confirms that. However, the shields somehow left Max and his friends unable to transform into Turbo Modes.
Much later Max and his team invaded Mortum's Temple and the brain shield temporarily protected them. After Mortum realizes that they had the brain shields, he states that it was extremely fragile and that it could be easily be destroyed and decides to break them.
The brain shields are durable protectors capable of repelling a robot zombie with a medium T.U.R.B.O. Energy explosion if its user is being attacked by one. Its only weak point is that Max and his team were unable to transform into Turbo Modes thanks to the shield.