Ultimate Fantastic Four #50

Thanos returns as a new story arc begins in our fateful 50th issue! The F.F. return from Siberia to find the Baxter Building-and the rest of New York City-under siege! The prize is the greatest force in existence-the Cosmic Cube! And in the race to command this deadliest of weapons, treachery and overkill are the order of the day...even from former friends! Writer Mike Carey has been building up to this saga for months-and new series penciler Tyler Kirkham (NEW AVENGERS/TRANSFORMERS) has arrived to kick off the action!