The mutants are back for the third time for Halloween and this time they arrive at what they think is a new boarding school for mutants only to discover it's actually a prison run by Winter to make aquarium gravel for her own benefit. When they try to escape, they accidentally open a portal to the human A.N.T. boarding school and meet the human versions of themselves. Enjoying their newfound freedom in this world, the mutants trick human Chyna and the gang to go through the portal and take their places back in the mutant world, while they pretend to be human in the alternate world. Mutant Chyna, realizing what has happened, tries to save the humans.
- China Anne McClain as Chyna Parks / Medusa
- Sierra McCormick as Olive Doyle / Mad Scientist
- Jake Short as Fletcher Quimby / Vampire
- Stefanie Scott as Lexi Reed / Mermaid
- Aedin Mincks as Angus Chestnut / Zombie
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