Marvel's Hulk and the Agents of S.M.A.S.H. - Season 2 Episode 6 Future Shock
6.1025 minutes
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.