Marvel’s Riskiest Casting Bets Pay Off as Avengers: Endgame Closes the Saga

With Avengers: Endgame poised to bring a decade of interconnected Marvel storytelling to a head, the cast and Marvel Studios' casting chief Sarah Halley Finn opened up in a new interview about how the franchise's ensemble was assembled — and why the studio's most uncertain picks ended up defining the MCU. Finn and Marvel Studios president Kevin Feige described a process that begins with a director's vision and the feeling an audience is meant to leave with, and it has produced results the filmmakers still marvel at. Feige explained that the studio seeks out performers so charismatic and dynamic that audiences simply want to watch them, whether or not they're wearing a cape.

The stakes were high from the very beginning. Robert Downey Jr. was the first actor Marvel ever cast, as Iron Man, and Feige recalled real concerns about whether he was an action hero or a name that could promote a family film — the studio was so confident in him creatively that Finn suggested screen tests to let the best person win. Scarlett Johansson, who joined as Natasha Romanoff in Iron Man 2, hadn't done much stunt or action work at the time, yet everyone was blown away after her first day of training with the stunt coordinator. Casting Captain America and Thor in an overlapping window presented a different kind of gamble: a Shakespearean figure and a period hero in tights, with no guarantee of how audiences would respond. Both Finn and Chris Evans emphasized that the priority was the purity of storytelling rather than landing the biggest available star — Evans described the role as incredible good fortune, while Chris Hemsworth admitted it was by far the biggest body of work he had been part of at that point.

Some of the best decisions came from happy accidents. Finn revealed that Chadwick Boseman originally auditioned for Drax, bringing a ferocity, dignity and regality that didn't fit that part — but made him the obvious choice when it came time to cast Black Panther. Boseman recounted that his agent told him to answer his phone within ten minutes, and Feige simply asked if he was interested in the character; it felt, he said, like something he was supposed to do. For Spider-Man, Feige knew whoever was cast would have to hold his own opposite Downey and Evans, and he recognized Tom Holland's talent as well as his athleticism and discipline as a dancer. Holland, meanwhile, recalled that on their first scene together in Atlanta, Downey encouraged him to improvise instead of sticking to what was on the page — exciting, but nerve-wracking for a newcomer worried about whether a joke would land.

The actors also reflected on what the journey has meant as the franchise approaches its finish line. Tom Hiddleston revealed he originally auditioned for Thor before being cast as Loki, with no idea a larger cinematic universe was being dreamed up at the time, and Evans and Hemsworth spoke openly about the scale of the ride they've shared alongside Holland. Holland described the carefully crafted storytelling finally coming to a head in Endgame as staggering, having watched those characters grow together over years of films. Director Joe Russo said the sheer number of movie stars in the film is unprecedented in scope and scale, built on ten years of emotional investment from the audience.

That combination — a casting philosophy grounded in creative conviction, from Downey's screen test to Boseman's leap from Drax to Wakanda — is what makes Endgame land as more than just another sequel. The film doesn't only close a story; it cashes in on a decade of bets on the right performers, made when there was no guarantee they'd pay off. Now those bets are converging in one final film, and the audiences who watched it all unfold are the reason it matters.