Iron Man at your service!

Today the superhero, or rather, the actor who plays the iconic Marvel hero turns 55 years old. 

In his five and half decades, Robert Downey Jr. has played some of TV and film's most iconic roles where it's hard to decide which is his best.

Of course, he has dominated the silver screen for the past decade as Iron Man, the quick-witted playboy who was the heart of his own films as well as the Avengers movies.

That said, we've also seen the New York City native define other fictional characters, such as in Sherlock Holmes and the recent Dolittle.

While we also are used to seeing him in movie theaters, true fans remember he also was a huge part of Ally McBeal and even had a short stint on Saturday Night Live.

With all that talent, it's no surprise the actor has won a BAFTA, People's Choice Awards and Golden Globes trophy, as well as been nominated for an Academy Award.

And while we can't wait to see him return to our screens with his next big project, we're taking the day to celebrate his birthday by looking back at all his best roles.

See our roundup below and then sound off on which one is your favorite.

Robert Downey Jr., Best Roles, Weird Science

Universal Pictures

Julia Louis-Dreyfus, Robert Downey Jr., Joan Cusack, Anthony Michael Hall, Saturday Night Live

NBCU Photo Bank

Robert Downey Jr., The Pick-Up Artist

20th Century Fox

Robert Downey Jr., Less Than Zero

20th Century Fox

Robert Downey Jr. Johnny Be Good

Twentieth Century Fox

Robert Downey Jr., Air America

Carolco Pictures

Robert Downey Jr, Soapdish

Paramount Pictures

Robert Downey Jr, Chaplin

Lions Gate Home Entertainment

Robert Downey Jr, Wonder Boys

Paramount Pictures

Robert Downey Jr., Best Roles, Ally McBeal

FOX

Kiss Kiss Bang Bang, Robert Downey Jr.

Warner Bros.

Robert Downey Jr., Good Night, and Good Luck

Warner Independent Pictures

Robert Downey Jr, Zodiac

Paramount Pictures

Robert Downey Jr, Iron Man

Paramount Pictures

Tropic Thunder, Robert Downey Jr.

Dreamworks Pictures

Robert Downey Jr., Jamie Foxx, The Soloist

Paramount Pictures

Sherlock Holmes, Jude Law, Robert Downey Jr.

Warner Bros. Pictures

Iron Man 2, Randy's Donuts

Paramount Pictures

Robert Downey Jr., Due Date

Warner Bros. Entertainment

Robert Downey Jr., Best Roles, Sherlock Holmes: A Game of Shadows

Warner Bros. Pictures

The Avengers

Marvel

Iron Man 3

Marvel/Walt Disney Pictures

Robert Downey Jr., Best Roles, The Judge

Warner Bros. Pictures

Robert Downey Jr., Best Roles, Avengers: Age of Ultron

Marvel Studios/Walt Disney Pictures

Spider-Man Homecoming, Jon Favreau, Robert Downey Jr., Tom Holland

Chuck Zlotnick/Marvel

Robert Downey Jr., Avengers: Infinity War

Marvel Studios

Robert Downey Jr., Best Roles, Avengers: Endgame

Marvel Studios/Walt Disney Pictures

Robert Downey Jr., Dolittle

Universal Pictures

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