The first sequel to Iron Man and the first sequel to Captain America are so similar. They both feature heroes butting up against government officials, massive conspiracies, and agents of S.H.I.E.L.D. They both get into complicated, flirtatious relationships with Black Widow. They both spar with Nick Fury. And each hero even changes into a new costume to reflect their changing personalities.

And yet Captain America: The Winter Soldier is one of the most beloved Marvel Cinematic Universe movies, and Iron Man 2 is ... well, not. The newest video from ScreenCrush’s Ryan Arey tries to pin down why two very comparable movies resulted in such different outcomes. He ultimately finds there’s one scene that explains why Captain America: The Winter Soldier worked and Iron Man 2 didn’t. Watch his findings below:

If you liked this video comparing Iron Man 2 and Captain America: The Winter Soldier, check out more of our videos below, including our essay on the secret meaning of Spider-Man: Far From Home, check out some more of our videos below, including our essay on what makes Iron Man works (and makes Man of Steel not work), and our theory about Obadiah Stane and Hydra. Plus, there’s tons more over at ScreenCrush’s YouTube channel. Be sure to subscribe to catch all our future episodes.

Gallery — The Evolution of Every Avengers Costume, From Movie to Movie: