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Catalyst Prime: Seven Days Vol. 1 is written by Gail Simone and published by Simon and Schuster. It's available with International Standard Book Number or ISBN identification 162010928X (ISBN 10) and 9781620109281 (ISBN 13).
The meteors that fell to Earth two years ago and gifted people with enhanced abilities were only the beginning. Now the source of those meteors has returned to finish the job and finish humanity off for good. His name is Khrelan and he's given humanity seven days to make their peace before he terraforms the Earth to suit his needs killing all of humanity in the process. New and old heroes join forces to stop Khrelan, but even if he's defeated, what will be left in the aftermath? Seven days to live, what does humanity choose to do with them?