We've all seen Captain America gloriously catching Thanos' massive fist in the Avengers: Infinity War trailer (and his even more glorious beard), but it's not entirely clear where he is and/or where he's been leading up to that point. So, precisely where is Captain America prior to Avengers: Infinity War? Well, it's prudent to review his entire MCU history so we can understand just how he got to this point where he seems to be unkempt and on the run.
A young man from New York named Steve Rogers desperately wanted to join the Army in 1942, but he was deemed too physically frail. He had heart, though, and Dr. Abraham Erskine (Stanley Tucci) took note of this, deciding to use Steve for his super-soldier experiment. Thus Captain America was born. Unfortunately, Erskine had first attempted this with Hydra leader Johann Schmidt (Hugo Weaving) before he had perfected it, which is how Schmidt was turned into the super-villain, Red Skull. This film, Captain America: The First Avenger, was the first to center around an Infinity Stone (the Tesseract, in this case), and it ended with Red Skull perhaps being disintegrated by the Tesseract. Of course, it's also possible he was transported across space by it and will return at some point.
Steve Rogers Lost His Best Friend Bucky Barnes, Before Being Frozen In The Ocean
When Captain America was first sent overseas to serve the Red, White, and Blue, he was paraded around as a mascot. However, while performing for the troops on the front lines, his friend Bucky Barnes (Sebastian Stan) was captured by Hydra, and Steve defied orders to go on a rescue mission. He succeeded, simultaneously proving his worth as a soldier, and becoming the leader of the Howling Commandos, a group of elite soldiers which included Bucky Barnes. On a later mission, which pitted the Howling Commandos against Hydra troops, Bucky was seemingly killed when he fell from a train. Cap eventually triumphed over Red Skull, but in doing so, had to crash a plane into the ocean where he was frozen in ice. S.H.I.E.L.D. collected him and kept him on ice until 2011.
Cap Proved He Could Lead Another Elite Group Of Warriors In 'The Avengers'
The Avengers were first assembled in 2012, but they certainly weren't built on trust. Right from the get-go it was clear that Cap didn't have blind faith in Fury (Samuel L. Jackson) or S.H.I.E.L.D. as a whole. His fears were compounded when he found weapons engineered by S.H.I.E.L.D. using the Tesseract. What's more, even the functionality of the Avengers themselves as a team was strained from the beginning, mostly because of the icy relationship between the selfish Tony Stark (Robert Downey Jr.) and Cap. This iciness would define the Avengers going forward.
Bucky Returned To Complicate Cap's Life In 'Captain America: The Winter Soldier'
While Bucky Barnes was believed to be killed during World War II, it turns out he was collected by Hydra, subjected to experimentation, and ultimately turned into the assassin known as the Winter Soldier. Cap was forced to go toe-to-toe with the assassin, and was rocked upon discovering his identity. To complicate matters, Hydra was effectively running S.H.I.E.L.D. at the highest levels, and had directed Bucky to kill Cap. In the end, S.H.I.E.L.D. crumbled, but Bucky started to remember who he was and went on the lam.
The Avengers Were Finally Torn Apart In 'Captain America: Civil War'
After Bucky resurfaced, only to be framed for the murder of King T'Chaka (John Kani) of Wakanda, Steve stood by his old friend as he was hunted, the two going on the run together along with Sam Wilson (Anthony Mackie). Meanwhile, tensions were already high among the (Earthbound) Avengers as the UN, Secretary of State, and Tony Stark were pushing for the team to sign the Sokovia Accords, which would relinquish control of the Avengers to the international governmental body. They were split right down the middle on the matter. Between that and the Bucky Barnes issue (especially once Tony learned Bucky had killed his parents), the Avengers were torn asunder.
Cap Dropped Bucky Off In Wakanda And Went On The Run
Fortunately, Cap was able to convince T'Challa (Chadwick Boseman) of Bucky's innocence vis-a-vis King T'Chaka's death, and the post-credits scene of Civil War showed Bucky preparing to undergo a procedure to undo the brainwashing of Hydra in Wakanda. It's implied that Cap brought him there for safekeeping before going on the run, having become an international fugitive as a result of Civil War.
Fast forward to another post-credits scene in Wakanda, this time at the end of Black Panther, where we see Bucky again now unfrozen and recuperating in peace. Interestingly, he's referred to by Wakandan children as "White Wolf," who is a Marvel superhero of a different identity, which has raised questions about who Bucky will become.