I am the one, who's creating the monsters.

Listed below on the page is a List of Monsters, either created by Seth Harper or Principal Grey. Feel free to add to it as you wish.


A monster is a creature created to destroy Mech-X4 and the team, but it's especially created to destroy Ryan Walker, the pilot of the robot. Monsters have been featured in every episode since the first, and it's possible they will continue to do so in Season 2.


Season 1

Let's Call It MECH-X4!

  • Jaguarsaurus and Octiconda (created by Principal Grey)

Let's Get Some Air!

Let's Open The Monster Heart!

  • No monster was featured in this episode, since the team was trying to open the primorphous core, and Grey attacked them in trying to get it back.


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