Captain N Wiki
The Mirror Warp

The Mirror Warp is a giant mirror that serves as a portal to the Mirror Zone. When a resident of Videoland enters the Mirror Zone, his or her Mirror Image Opposite (counterpart from the Mirror Zone) is briefly able to cross over into the real world.

Having a Mirror Image Opposite and his or her real-world counterpart on the same side of the Mirror Warp will unbalance and shatter the mirror, as seen when King Charles and Mirror King Charles both crossed over into the Mirror Zone.