

The Hulks finally return to Earth only to discover that they're centuries too late as the High Evolutionary devolved all humans into primitive beasts. He devolves the Hulks too, but Skaar is unaffected and steps up to save the team and all of mankind.
While looking for a way back to Earth, the Hulks discover the Leader stowed away on board the ship. Retribution must wait as the Agents of S.M.A.S.H. have to fight Ronan the Accuser and his Kree soldiers to save an old foe: Ego the Living Planet. But when Galactus comes to consume Ego the Living Planet, the Agents of S.M.A.S.H. must put themselves at risk to save the lives of their two enemies.
The Hulks want retribution against the Leader, who is stowed away on their ship, but their plans change when they realize their old foe, Ego the Living Planet, is in danger from Ronan the Accuser and his soldiers looking to destroy him.