Raven and Rhydian Rivers, also known as X-42 and X-43 are 15 year old, mutant, girl and boy, who were, from the moment they where created, trained to become assassins. Their most often targets are the mutant found on the streets. That was until Professor X found them. They have just moved into the X mansion, and they are extremely dangerous mutants. They have over 5 known mutant powers making them extremely dangerous. Now they have to get used to life, without killing there fellow mutant team mates.