The Extinction Team’s first field mission was recovering the stolen head of the Dreaming Celestial which was stolen by Mister Sinister. Alerted by their brethren’s plight, the other Celestials arrived on Earth without any indication on their agenda. After accomplishing their mission, Cyclops and the rest of the Extinction Team faced down the indomitable Celestials and asked them to leave Earth.
From – Uncanny X-Men Vol. 2 #3