Fantastic Four vs. X-Men #1

Direct

Franklin has a dream in which an old journal of his father's causes the death of the F.F. and the X-Men; Sue finds the journal in question and reads a terrible tale wriiten within; With Kitty Pryde discorporating from her injuries from the Mutant Massacre, the X-Men turn to Reed Richards to save her; Reed gets cold feet which starts a fight between the F.F. and the X-Men.