Captured and restrained, Sabretooth, one of the X-Men's most bitter enemies, has reached out to Professor Xavier for help. Sabretooth has never held back the more bestial side of his personality, and now that same side threatens to overwhelm him. A hostile air hangs thoughout the mansion as the X-Men share their home with this "guest", knowing that until his savage urge is suppressed, Sabretooth remains a ferocious animal, chained in a cage.