The rat colony from the Red One Motel were having a wail of a time in its grimy rooms, over-spilling trash cans and cracks in the walls, so long as they didn’t run into Bernie. Unfortunately they were wiped out by the Xantiax gas which is highly toxic for animals. All of them, you say? No, not all of them! One survived. But Sprinter’s natural resistance has reversed the effects of the gas and he’s now enormous and extremely aggressive. Just the kind of thing Cortez likes!