After a long absence from comics, he was brought back as the Winter Soldier.

Outside the comics, Bucky, as played by Sebastian Stan, has become a staple of the MCU.

Meet Alpine, Buckys beloved cat.

Sebastian Stan’s Bucky Barnes uses his original bionic arm in Captain America The Winter Soldier and What If

Alpine was introduced in the 2018 comic seriesWinter Soldierby Kyle Higgins and Rod Reis.

At that point, she was an unnamed cat that Bucky treated with care and affection.

But Bucky did not send R.J. back to where he came from.

Split image of Scarlett Johansson’s natasha Romanoff leaning against a wall in Captain America The Winter Soldier (2014) on the left, Sebastian Stan’s Bucky Barnes with the Thunderbolts in Thunderbolts (2025) on the right

Bucky takes R.J. in and tries to help him navigate his traumaand learn who he is outside of Hydra.

However, Hydra is difficult to escape, asBucky knows all too well.R.J.

’s handler returns in an attempt to bring the boy back into the fold.

New Black Widow Costume in Thunderbolts Doomstrike Art

Of the two, Bucky still has an on-again, off-again relationship with Natasha in todays comics.

But their love always triumphed.

Bucky intercepts a truck transporting the shield to Tony Stark and ambushes it,taking the shield for himself.

Split image of Bucky Barnes in Captain America Civil War and Thunderbolts*

Custom Image by Zoe Miskelly

One significant and humorous way that Buckys Captain America differs from Steves isBuckys fondness for weapons.

During the war, Bucky also fought alongside Captain America as his partner in the Army.

More recently,Bucky has been not only a member of the Thunderbolts,but their leader.

Comics

During the period whenBucky trained Natasha,the two began a secret love affair.

Both knew that their handlers could never find out, or the repercussions would be dire.

He was responsible for many deaths, but one in particular was extremely tragic.

Buckys assassination of Itsu had huge implications for Logan.