In this Halloween version of the pilot episode "transplANTed", it is Chyna's first day in the "MUTANT Program", where the ANTs and Gibson are monsters and the older kids are regular humans. Chyna is a Medusa, so she fits right in with her new Mutant Program friends: Olive, a mad scientist; Fletcher, a vampire; and Angus, a zombie. The social hierarchy roles have been reversed and the older kids are actually scared of the ANTs, so Gibson pairs everybody off to help prepare for the "mutants only" Halloween dance.

When a deafening noise caused by Fletcher makes Olive lose her memory, Chyna, Fletcher, and Angus go to great lengths to get her memory back before Principal Skidmore dismisses her from the A.N.T. Program and sends her to kindergarten. Chyna later finds out that Olive actually regained her memory but is pretending that she has not. Meanwhile, Lexi and Cameron enter the Webster High dog show hosted by Gibson.