We have come to really love MCU's Steve, Bucky, and Sam. In many ways, we've seen massive portions of their life unfold before the big screen, giving us some truly heartbreaking moments. Most notably is Bucky's descent into the dark side, becoming the ominous Winter Soldier right before our eyes. Nothing is worse than reuniting with your best friend, only for him not to recognize you while also trying to kill you. Here are some of the most heartbreaking things fans have noticed about Steve, Bucky, and Sam.
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