|Original Airdate||August 18, 2013|
|Directed by||Roy Smith|
|Written by||Henry Gilroy|
|Previous||Doorway To Destruction, Part 2|
Blastaar causes troubles in the tunnels and fights the Agents of S.M.A.S.H. until Iron Man arrives to help. He is defeated by Hulk and She-Hulk where Blastaar escapes back to the Negative Zone. They then travel to Stark Industries and the Hulkbusters armor that is modeled to take on the Agents of S.M.A.S.H. in case they got out of control. Leader hijacks the Hulkbusters to attack the Agents of S.M.A.S.H. Iron Man comes to their aid and helps to fight the Hulkbusters. Iron Man uses his holograms to fool the Hulkbusters into thinking that they destroyed them. Iron Man showed them footage on the Stealth-Bot infecting a virus in the Hulkbusters armor so that they can be controlled from the outside. Using parts from the defeated Hulkbusters, the Agents of S.M.A.S.H. use them to take on the remaining Hulkbusters. The Hulkbusters then activate magnetizing beams to combine all of them into one giant Hulkbuster as it captures Iron Man and flies off. The Agents of S.M.A.S.H. pursue the giant Hulkbuster where Iron Man states that his Arc Reactor is being used to power the giant Hulkbuster and use it as a bomb where Iron Man and the Agents of S.M.A.S.H. will be blamed for the city's destruction. After freeing Iron Man, Hulk redirects the defeated Hulkbuster into the river. Iron Man states that he will dismantle the Hulkbusters, but Hulk insists that he keep one Hulkbuster in case he gets out of control.