Citizen Toxie: The Toxic Avenger IV

The Toxic Avenger must defend his friends from his own evil alternate universe doppelgänger, The Noxious Offender.
A horrific explosion creates a dimensional portal between Tromaville and its dimensional mirror image, Amortville. While the Toxie is trapped in the mirror dimension, Tromaville comes under the control of his evil doppelganger, the Noxious Offender.