Who's who in "Captain America: Civil War"

Marvel's latest superhero showdown features the most costumed characters they've fit into one film yet, so it's understandable if you're having trouble keeping track of them all.

Click through to get a refresher on who's who, where you've seen them before and where they're going.

Avengers disassembled

At the heart of "Captain America: Civil War" is a conflict between two headlining members of the Avengers: Captain America (Chris Evans) and Iron Man (Robert Downey, Jr.), who are at odds over how much oversight the United Nations should have over their super-powered team of heroes.

Captain America

Marvel's main super-soldier, scrawny Steve Rogers (Evans) was transformed into Captain America during WWII to fight Hydra, an unstoppable secret organization working with the Nazis. His victory came at a cost, as Rogers himself was lost in the Arctic for decades, after which he was thawed out fully preserved, waking up into a 21st century world he has never felt quite a part of.

Past appearances:
"Captain America: The First Avenger" (2011)
"Marvel's The Avengers" (2012)
"Captain America: The Winter Soldier" (2014)
"Avengers: Age of Ultron" (2015)

Iron Man

Tony Stark (Downey) kicked off the Marvel Cinematic Universe by becoming Iron Man and inspiring S.H.I.E.L.D. boss Nick Fury (Samuel L. Jackson) to star the Avengers initiative. He's battled his demons as both a booze-happy party boy and an extremely successful arms dealer, but his work with the Avengers has helped him turn over a new leaf.

Past appearances:
"Iron Man" (2008)
"Iron Man 2" (2010)
"Marvel's The Avengers" (2012)
"Iron Man 3" (2013)
"Avengers: Age of Ultron" (2015)

The Winter Soldier

Iron Man and Captain America's main conflict in "Civil War" is sparked by Bucky Barnes (Sebastian Stan), also known as the Winter Soldier. Barnes, Steve Roger's lifelong best friend, was thought to have died in WWII but was found by Hydra, supercharged and preserved much like Cap and brainwashed, turning him into a fearsome assassin. Rogers believes he can rehabilitate his troubled friend, but Stark thinks he's a menace with blood on his hands.

Past appearances:
"Captain America: The First Avenger" (2011)
"Captain America: The Winter Soldier" (2014)

Black Widow

Natasha Romanoff (Scarlett Johansson), a.k.a. Black Widow, is a former Russian spy with a checkered past and some serious fighting skills. She's also the only person who can really control Bruce Banner (Mark Ruffalo) when he's the Hulk.

Past appearances:
"Iron Man 2" (2010)
"Marvel's The Avengers" (2012)
"Captain America: The Winter Soldier" (2014)
"Avengers: Age of Ultron" (2015)

Hawkeye

Much like Black Widow, Clint Barton (Jeremy Renner) doesn't have any superpowers, but he is exceptionally skilled -- especially when it comes to wielding a bow and arrow. A long-time secret agent, Barton retired from The Avengers after fighting Ultron to spend time with his family, but he can't stay out of the conflict between between Cap and Iron Man.

Past appearances:
"Thor" (2011)
"Marvel's The Avengers" (2012)
"Avengers: Age of Ultron" (2015)

The Scarlet Witch

Wanda Maximoff (Elizabeth Olsen) developed the powers to warp reality to her whims after being subjected to Hydra experiments alongside her twin brother, Pietro (Aaron Johnson). At first an adversary of The Avengers -- with a vendetta against Tony Stark -- Maximoff has since become an Avenger. While mourning the death of her brother, she works with Captain America to better harness her powers.

Past appearances:
"The Avengers: Age of Ultron" (2015)

Vision

Originally Tony Stark's virtual assistant, Jarvis, Vision (Paul Bettany) came to life when Ultron attempted to use the mind stone -- one of the Infinity Gems -- to create an unstoppable body for himself. He's an artificial intelligence being unlike anything the Avengers have seen before.

Past appearances:
"Iron Man" (2008, as Jarvis)
"Iron Man 2" (2010, as Jarvis)
"Marvel's The Avengers" (2012, as Jarvis)
"Iron Man 3" (2013, as Jarvis)
"Avengers: Age of Ultron" (2015)

War Machine

Tony Stark's best friend and main military contact, Capt. James "Rhodey" Rhodes (Don Cheadle) is an obvious member of Team Iron Man in the conflict at the heart of "Civil War." He's part Avenger, part soldier.

Past appearances:
"Iron Man" (2008, played by Terrence Howard)
"Iron Man 2" (2010)
"Iron Man 3" (2013)
"Avengers: Age of Ultron" (2015)

Falcon

Another military vet now serving as an Avenger, Sam Wilson befriended Steve Rogers before taking on the superhero persona Falcon. As Rogers' new bestie, he has a contentious relationship with Bucky Barnes.

Past appearances:
"Captain America: The Winter Soldier" (2014)
"Avengers: Age of Ultron" (2015)
"Ant-Man" (2015)

Ant-Man

Wisecracking reformed thief Scott Lang (Paul Rudd) is eager to show the Avengers what he's capable of in his Ant-Man suit -- and he already got a head start going toe-to-toe with Falcon last year.

Past appearances:
"Ant-Man" (2015)

Black Panther

As the sworn guardian of his native Wakanda, T'Challa (Chadwick Boseman) takes on the Black Panther title to seek out justice for his people. And there's a reason his suit is just as durable as Captain America's shield.

Future appearances:
"Black Panther" (2018)

Spider-Man

Your friendly neighborhood Spider-Man is back, as Tony Stark seeks out Queens teenager Peter Parker (Tom Holland) after some interesting videos go viral.

Future appearances:
"Spider-Man: Homecoming" (2017)

Agent 13

The mysterious S.H.I.E.L.D. agent (Emily VanCamp) tasked with keeping tabs on Steve Rogers before the organization's collapse is still a loyal ally -- and she holds a secret that connects her to the Captain's past.

Previous appearances:
"Captain America: The Winter Soldier" (2014)

Thaddeus Ross

The last time audiences saw "Thunderbolt" Ross (William Hurt), he was a general tangling with the newly unleashed Hulk. Now he's Secretary of State, and he has a plan to bring some order to the Avengers and their peacekeeping missions.

Past appearances:
"The Incredible Hulk" (2008)

Crossbones

Former S.H.I.E.L.D. agent Brock Rumlow used to fight alongside Captain America and Black Widow, but after he was exposed as a part of Hydra and tussled with Falcon, he was presumed dead. Not so fast, as Rumlow was saved and transformed into destructive and dangerous Crossbones -- and he's got it in for Cap.

Past appearances:
"Captain America: The Winter Soldier" (2014)

Missing in action

But what about two of the Avengers' more powerful members? The Hulk (Mark Ruffalo) and Thor (Chris Hemsworth) are M.I.A. following the fight against Ultron, but they won't be gone for long.

Future appearances:
"Thor: Ragnarok" (2017)