Is Jean grey the most powerful mutant?

Yes! But when the power can't be tamed even by the weilder... it becomes self distructive...
So most powerful is relative and that's how the creators wants it to be ..giving every character it's own strengths and weaknesses ... for me, I would say proffessor X is the most powerful. He had godpower and could control it... gene had same power n more bu couldn't control hers till her death.

3verblazing:
Yes! But when the power can't be tamed even by the weilder... it becomes self distructive...
So most powerful is relative and that's how the creators wants it to be ..giving every character it's own strengths and weaknesses ... for me, I would say proffessor X is the most powerful. He had godpower and could control it... gene had same power n more bu couldn't control hers till her death.

But she transformored into a god in the dark Phoenix because am wondering if she's part of the immortals

I think the Scarlet Witch is more Powerful.

for me i have always believed Jean Gray is the most powerful