X-Men: Dark Phoenix Saga (#129-138)

Returning from a mission in space, Jean Grey is exposed to the deadly radiation of a solar flare, and briefly attains her ultimate potential as a telepath and telekinetic. Jean becomes a being of pure thought, and then reforms herself upon return to Earth with the new costume, identity and power of "Phoenix".[2] It is with this incredible power that Jean repairs the fractured M'Kraan Crystal, but voluntarily restrains her powers afterward in order to keep them under control...

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