The rise of the Russo brothers — from going into credit card debt for their first movie to directing 'Avengers: Infinity War'

But the duo did just that, and the crown jewel of the Marvel Cinematic Universe comes to theaters on April 27.

The pair started their career on the film festival circuit, and struggled to finance their first independent, low-budget film, called "Pieces." Swimming in debt, they were eventually called by filmmaker and producer Steven Soderbergh, who had seen "Pieces" at the Slamdance Film Festival and wanted to produce their next film.

From there, the brothers would mostly take on TV projects, primarily sitcoms such as "Arrested Development," "Happy Endings," and "Community."

Now, the Russos are ready to deliver the most anticipated superhero film of all time — and certainly one of the most ambitious crossover events ever — which could very well smash box office records.

Needless to say, it's an unusual career.

Here's a closer look at the career of the Russo Brothers:

Joe (left) and Anthony (right) Russo grew up in Cleveland, Ohio. Anthony was born in 1970 and Joe in 1971.

Joe (in front) has collected comic books since he was 10 years old. His favorite character was Spider-Man.

They were graduate students at Case Western Reserve University, a private university in Cleveland, when they started making their first film. Joe was a theatre student while Anthony was in the School of Law — their father was an attorney.

That first feature was a small 1997 film called "Pieces" that they financed themselves and premiered at the low-budget, independent film festival Slamdance Film Festival.

The Russos told Deadline earlier this year that the film cost $30,000 to make — much more than they anticipated.

They told Deadline they were inspired by Robert Rodriguez's low-budget movie "El Mariachi," which they read was made for $7,000. Anthony said they didn't pay off the credit card debt accumulated when making "Pieces" until a decade later.

The two went to UCLA to pursue degrees in film. Not only were they still in debt from "Pieces," but Joe had just had his first of two daughters.

A call from a notable filmmaker would give them hope, though.

Steven Soderbergh saw "Pieces" at Slamdance and called the brothers about producing their next film, which would result in the 2002 crime-comedy "Welcome to Collinwood," starring George Clooney, William H. Macy, and Sam Rockwell.

The Russos told Deadline that Soderbergh loved the movie and found it inspiring: "

The Russos directed two episodes, including the pilot, of the short-lived FX series "Lucky" in 2003. The series ended after one season.

The Russos were executive producers on and directed multiple episodes of the comedy "Arrested Development" during its original three-season run on Fox from 2003 to 2005.

They often directed their own episodes, except for the very first episode of the series, which they directed together and won an Emmy for.

The brothers' next feature was the 2006 romantic comedy, "You, Me and Dupree," starring Owen Wilson, Kate Hudson, and Matt Dillon.

The movie was critically panned, and has a 20% on review-aggregator Rotten Tomatoes.

The Russos went on to direct and produce multiple TV shows, including ABC's "Happy Endings" and NBC's "Community."

Their work on "Community" caught the eye of Marvel Studios president Kevin Feige.

The Russos told The Los Angeles Times in a 2016 interview that they got a call from their agent one day that they were on the shortlist to direct "Captain America: The Winter Soldier," the sequel to "Captain America: The First Avenger."

The duo ended up getting the job to direct Marvel's "Captain America: The Winter Soldier," released in 2014, and injected it with political intrigue not seen in the Marvel Cinematic Universe at that point.

"The Winter Soldier" received positive reviews, and has 89% on Rotten Tomatoes.

They then directed the next "Captain America" film, 2016's "Captain America: Civil War," which pitted Cap against Iron Man over the government registration of superhumans.

"Civil War" received even more praise, and has 91% on Rotten Tomatoes.

The brothers are developing an FX crime drama called "The Mastermind" with "Fargo" and "Legion" creator Noah Hawley.

The Russos will direct the series based on the true story of Paul Le Roux, a cartel boss-turned-informant for the DEA.

The success of their "Captain America" films landed the Russos their shot at the crown jewel of the Marvel Cinematic Universe: "Avengers: Infinity War." The film comes to theaters April 27, and is the biggest superhero movie ever made.

"Infinity War" and a fourth "Avengers" movie were filmed back-to-back by the Russos. It comes to theaters next year, but a title has yet to be revealed. It was originally called "Infinity War Part 2."

Not bad for a pair who came from TV sitcoms.

More on Marvel:

Captain America vs. Iron Man: we debate who's right in 'Civil War'
All the Marvel Cinematic Universe details you need to remember before seeing 'Avengers: Infinity War'
The 'Infinity War' directors changed their Twitter profile picture, and fans think it's a clue to Captain America's fate
12 comics you should read if you love the Marvel Cinematic Universe