Bishop 's knowledge of the future was the only thing that stopped Onslaught from killing the X-Men .
The traitor in the X-Men was eventually revealed to be Professor X in the form of Onslaught .
Bishop 's knowledge of the future was the only thing that stopped Onslaught from killing the X-Men .
The traitor in the X-Men was eventually revealed to be Professor X in the form of Onslaught .