4. Hydra's Still Around (And Has The Yellowjacket Serum)
Captain America: The Winter Soldier revealed evil organisation Hydra had infiltrated S.H.I.E.LD., only for Avengers: Age Of Ultron to open up with Earth's Mightiest Heroes destroying their last secret cell. However, Ant-Man confirms something that those who watch Agents Of S.H.I.E.L.D. will already be acutely aware of; they're not totally gone. Darren Cross is planning to sell the Yellowjacket suits to the Hydra, revealing that former-Nazi splinter cell aren't done being a major MCU threat (they'll likely next appear in Captain America: Civil War). But there's more to it than simple confirmation of an underlying threat. They leave the whole fracas at Pym Tech in possession of the Yellowjacket serum. The logistics of this pseudo-science are all pretty vague, so quite what they'll be able to do without the suit isn't clear, which is actually rather exciting; anything can happen. This will probably wind up a minor part of Civil War, or is being left open for a possible Ant-Man sequel.
