Are the X-Men prepared for the unstoppable return of the Juggernaut?

Today the X-Men being to face the battle of their lives, Juggernaut has come to them for the questions about a foe that could mean the end to all life on earth, Professor Xavier's mysterious behavior has took a turn for the worse something cannonball cannot possibly shake of his shoulders, Betsy's newly aqquired Crimson Dawn Tatto begins to trouble her newly found relationship more and more, but one question still remains.....Who is Onslaught?