Uncanny X-Men Vol 1 #512

“The Origin of the Species”
Published by Marvel Comics
August, 2009

X-Club, along with Angel and Psylocke plan on traveling back to 1906, before Dr. Nemesis was born, to gather DNA samples from his parents so that they can investigate the emergence of the modern mutant race.
Psylocke is essential so that she can psychically disguise Beast.
The time travel devices that they’ve invented have a dangerous side-effect that involves death, so they have to return in thirty-two and a half hours.

Cover Artist: Yanick Paquette
Writer: Matt Fraction
Artist: Yanick Paquette