Impossible Man arrives at the base of the Agents of S.M.A.S.H., posing as Fin Fang Foom. He fights them until Hulk sees through his ploy. Hulk even mentioned that the Avengers have a record on Impossible Man. Impossible Man states that wants to join the Hulks where he transforms into a Hulk version of himself. Impossible Man even used his powers to combine Hulk and Red Hulk into the Two-Headed Compound Hulk. When Sauron attacks a seaside amusement park with an army of prehistoric sea creatures, Impossible Man joins the Agents of S.M.A.S.H. into fighting Sauron. When Impossible Man manages to trap Sauron, his powers are drained by Sauron who uses them to fight the Agents of S.M.A.S.H. even when he summons Fin Fang Foom. After Impossible Man regained his powers and Fin Fang Foom knocked Sauron far out into the ocean, Impossible Man borrows a device from Henry Pym's laboratory which he uses to grow the Two-Headed Compound Hulk to large size where he tosses Fin Fang Foom out to sea. Impossible Man then leaves to get his footage uploaded. Impossible Man then returns where he splits the Two-Headed Compound Hulk back into Hulk and Red Hulk. When Impossible Man asks if he can join the show as their next door neighbor, Hulk and Red Hulk end up punching Impossible Man.
- This episode's title is a reference to Mission: Impossible TV/film series.