- Anthony – “Stackie.”
- Sebastian – “That's what-I've heard that name.”
- Anthony – “Really?”
- Sebastian – “Yeah online.”
- Anthony – “Dangit.”
- — Yahoo Entertainment Interview
Sebastian and Anthony both starred in the Marvel Cinematic Universe film Captain America: The Winter Soldier. They shared very few scenes together and didn't interact much on set. They were paired together for the press tour because the directors thought that it would help Sebastian talk more in interviews. At first, Sebastian didn't really know what to say to him, but as the press tour went on they started to hit off and became friends.
The two interacted more on the set of Captain America: Civil War, due to their characters actually having scenes together. During the press tour, they were paired together again, leading to the two sharing a lot of back and forth banner. The film was also where the two met Tom Holland, and have discussed in multiple interviews their "hatred" of said actor. Anthony also made an inside joke regarding how comfortable Sebastian's couch was, despite Sebastian claiming that Anthony's never even been to his house.
The duo starred The Falcon and The Winter Soldier TV Series as main leads and were paired again for The Falcon and The Winter Soldier online press tour. Many of the creators of the series, cited the previous press tours as ways to write the characters in the series, and was the whole reason the series exists. On the press, Anthony found out that Sebastian had celebrated a birthday party for Bucky and was upset that he had not been invited. Anthony mentioned that Sebastian was always isolated and it drove him nuts because he wanted Sebastian all to himself all the time Sebastian also admitted he had attachment issue to Anthony and that Anthony helped him become less shy. During the era, Anthony made an Instagram account and often mentioned Sebastian in his posts. Sebastian commented on one of his posts that he was with Anthony until the end of time, referencing one of his lines as Bucky.
According to Sebastian, Anthony is the only one that ever notices that he needs Lube to get into his Winter Soldier arm.
- Sebastian – “Yeah, I know. I don't always look homeless.”
- Anthony – “Those steel blue eyes let you know where home is. You know what I'm talkin' about. That's my safe space. In those beautiful eyes.”
- — He cleans up good
- Sebastian – “I'm trying. He's not here but I'm trying, okay. We all know who I'm talking about.”
- Anthony Russo – “He's chaneling the spirit of Anthony Mackie.”
- — How dare they separate them!
- Chadwick – “A team of people just rip your clothes off.”
- Sebastian – “It's like Anthony Mackie's Friday night.”
- — Sebastian can't not reference Mackie.
- “I would call Sebastian to get rid of a body...I've called him for much worse things and he's shown up.”
- — Anthony Mackie
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Fans started to ship the two during the Winter Soldier press tour. The duo became favorites of the marvel press tours. Many fans would go through their interview and create compilations of their best moments. After Sebastian's appearance at Jus In Bello, many joked that Ricky Whittle was a homewrecker for their relationship. Fans mentioned Anthony as the extrovert that adopted introvert Sebastian for friendship.
- Anthony calls Sebastian Vanilla Ice and Sexy Sea Bass, while, Sebastian calls Anthony Choclachino and Mack Attack.
- Sebastian gave Anthony a pocket square of his face for Christmas.
- EvanStackie refers to the ship between Chris Evans, Sebastian and Anthony
- SamBucky refers to the ship between their MCU characters; Sam Wilson and Bucky Barnes
- Anthony Mackie and Sebastian Stan on 'Avengers: Endgame,' time travel and 'Hot Tub Time Machine'
- Sebastian Stan & Anthony Mackie JOKINGLY Dragging Tom Holland for 10 minutes Straight!
- Anthony Mackie Wants Sebastian Stan To Be His Full-Time BFF – Watch Their Hilarious Bromance
- Sebastian Stan admits attachment issues to Anthony Mackie
- Sebastian Stan talks about Anthony Mackie helping him become less shy
- Anthony Mackie Doesn’t Like People Touching His “Sweet Spot"
- CAPTAIN AMERICA CIVIL WAR Cast Interviews
- Cast & Directors of "Captain America: Civil War" | BUILD Series
- Avengers: Infinity War': How 6 cosmos-shattering scenes affect Marvel future (spoilers!)
- Anthony Mackie Discusses Big Captain America Reveal in 'Avengers: Endgame' | EXTENDED INTERVIEW
- Watch! Sebastian Stan & Anthony Mackie Get Their Dance on at ‘Avengers: Endgame’ Premiere