Hulk is sent on his most dangerous mission yet, working for a secret subdivision of S.H.I.E.L.D.! After the events of Age of Ultron, history is breaking - and only the Hulk is strong enough to hold it together! It's Hulk vs. the Chronarchists in the last hours before the extinction of the dinosaurs, plus the mystery of the Tomorrow Man... and a team-up between Hulk and Bruce Banner?! Kid Colt, Two-Gun Kid, Rawhide Kid and the Black Knight guest star, but when the Chronarchists arrive in the time of Camelot, can the Hulk triumph against Merlin the magician? As Bruce Banner finds himself literally running out of time, the Hulk returns to the present... but which Hulk? Answers had better come fast, because the final showdown with the Chronarchists looms - and it's time to smash!