TV shows you won't believe turn 20 this year

Heidi Klum during a season one episode of "Project Runway."Barbara Nitke/Bravo/NBCU Photo Bank via Getty Images

• TV shows that came out in 2004 are turning 20 this year.
• It might be hard to believe it's been two decades since the premiere of "Entourage" or "House."

2004 was a big year.

Mark Zuckerberg released "TheFacebook" as a networking site for Harvard students, the Boston Red Sox won the World Series for the first time in 86 years, the Olympics were held in Athens, Greece, and it was the year of Janet Jackson's infamous Super Bowl wardrobe malfunction.

It was a major year for TV, too. Some iconic, highly lucrative TV shows like "Friends" — which earned its stars and writers an incredible $1.4 billion, according to Forbes — wrapped up in 2004.

But it was also the start of some of the most beloved series of the 2000s, from reality shows to kids' TV.

You might find it hard to believe the following shows got their start 20 years ago. Here's why they were so beloved and where you can watch them today, if you missed out the first time.