Watch: Robert Downey Jr.'s Iconic Screen Test for Iron Man

In the pantheon of Hollywood casting decisions, few are as legendary as the choice to cast Robert Downey Jr. as Tony Stark in Iron Man. This pivotal decision not only marked a turning point in Downey's career but also set the foundation for the Marvel Cinematic Universe (MCU), now one of the most successful film franchises in history.

Before landing the role of Tony Stark, Robert Downey Jr. was known for his immense talent, but also for his tumultuous personal life. His struggles with substance abuse and run-ins with the law had caused many in the industry to hesitate about casting him in major roles. However, director Jon Favreau saw something unique in Downey that convinced him to take a chance. Favreau believed that Downey's personal experiences, coupled with his undeniable charisma, made him the perfect fit for the complex character of Tony Stark.

The audition itself became the stuff of legend. Downey’s performance was a masterclass in wit, timing, and nuance. An excerpt from his screen test captures the essence of what made his portrayal of Tony Stark so iconic:

Audition Excerpt: "Mr. Stark, you have been described by some as a da Vinci for our time. What do you have to say about that?"

"Da Vinci? Ridiculous. I don't paint."

"And what do you have to say about the fact that Stark Weapons is responsible for millions of deaths since World War II?"

"Boy, let me guess. Berkeley? Ms.?"

"Miss Summer..........And it's brown."

"Okay. Well, uh, listen, Ms. Brown.........It's an imperfect world, but it's the only one we've got. I assure you, the day weapons are no longer needed to keep the peace, I'll happily transition to manufacturing bricks and beams for baby hospitals, making hemp pants and the like. But until that time, can I get you a drink?"

"You rehearse that much?"

"Every night in front of the mirror before bed. Why? Is it stale?"

"Wow. Wow, you really have all of this down."

"You ever lose an hour of sleep your whole life?"

"I gotta tell you, is that thing wrong? You're never gonna get me in the sack with that attitude."

In this exchange, Downey’s delivery is pitch-perfect, capturing the essence of Tony Stark—cocky, charming, and yet deeply aware of the moral ambiguities of his world. His quick wit, effortless confidence, and the subtle layering of emotions beneath his bravado were exactly what the role required. It was as if Tony Stark had leaped off the pages of the comic books and come to life in front of the casting directors.

This performance left no doubt that Robert Downey Jr. was the only choice for Tony Stark. Marvel Studios agreed, and Downey’s casting became a turning point in Hollywood history. Iron Man (2008) was a critical and commercial success, grossing over $585 million worldwide and launching the MCU, which has since become the highest-grossing film franchise of all time.

Downey’s portrayal of Tony Stark not only revitalized his own career but also redefined the superhero genre. Over the course of a decade, Downey’s Tony Stark evolved from a self-absorbed billionaire to a self-sacrificing hero, culminating in one of the most emotionally impactful story arcs in modern cinema.

Looking back, it's almost impossible to imagine anyone else in the role. Robert Downey Jr.'s audition wasn’t just an audition; it was the moment a legend was born, forever changing the landscape of Hollywood and the hearts of millions of fans around the world.