Operation S.i.n.

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Tying into the explosive events of Original Sin, see an untold story from the origins of the Marvel Universe! After an alien energy source is discovered in Russia in the early 1950's, it's up to Peggy Carter and Howard Stark to find out what happened. But a newly-risen terrorist group going by the name Hydra also happens to be on the hunt, for their own nefarious purposes! Also includes 'Captain America & the First Thirteen' #1.