Emplate was born Marius St. Croix, the brother of Generation X's M (Monet) and the M-Twins (Nicole & Claudette). When his mutant powers first manifested, his sisters were disgusted, especially Monet. In retaliation, Marius somehow turned Monet into the mute and diamond-skinned Penance. With their sister missing, Nicole and Claudette turned to Marius for answers, blaming him for her supposed death. They opened a dimensional portal to imprison Marius; afterwards, he called after Penance to join him, saying that only he could cure her. She followed after him and became his slave and "dinner" until the events of Generation X #1. The twins panicked and decided that they would pose as their missing sister so that their parents wouldn't be angry (as they thought that Monet was their favorite chil