ByDaniel Pearson, writer at Creators.co

When The Big Bang Theory exploded onto our screens in 2007, who'd have thought it would become the household sitcom staple it is today?

Old fashioned in the best possible way - four cameras, laugh tracks, and an apartment block setting - this now-classic comedy about four nerdy men and the three women who tolerate them is the closest thing we've had to sitcom perfection since Friends. Some fans whisper quietly that it may have even overtaken Friends.

The show may be 7 years old and counting, but there is much more life left in this dog yet. It's a cast of comedy professionals and it shows. Jim Parson as Sheldon Cooper may be the breakout star, but there is not one weak link.

Scroll below to see how the cast have changed since the show first aired, and what else they've been up to in the meantime... BAZINGA!

Johnny Galecki a.k.a... Dr. Leonard Hofstadter

Fun fact: Leonard's last name, Hofstadter, is a reference to two well-known scientists: Robert Hofstadter, who won the 1961 Nobel Laureate in Physics; and his son Douglas Hofstadter, whose best-selling book "Gödel, Escher, Bach: an Eternal Golden Braid," won the 1980 Pulitzer Prize for general nonfiction.

What else can I see him in? Hancock, In Time, Vanilla Sky

Jim Parsons a.k.a... Dr. Sheldon Cooper

Fun fact: In honor of Sheldon's catchphrase "Bazinga!", a team of Brazilian Biologists named a newly discovered type of orchid bee "Euglossa bazinga." Bees are Sheldon's third-favorite flying creature.

What else can I see him in? Garden State, The Muppets, The Normal Heart

Kaley Cuoco-Sweeting a.k.a... Penny

Fun fact: Penny is the only main character whose surname has yet to be revealed.

What else can I see her in? 8 Simple Rules, Brandy & Mr. Whiskers, Hop.

Simon Helberg a.k.a... Howard Wolowitz

Fun fact: Out of the main male characters, Howard is the only one who is yet to see Penny naked. He was the first to flirt with her, too...

What else can I see him in? Good Night, And Good Luck, Van Wilder: Party Liaison, A Serious Man.

Kunal Nayyar a.k.a... Dr. Rajesh "Raj" Koothrappali

Fun fact: Raj's inability to talk to women (except when drunk!) is based on an old co-worker of executive producer Bill Prady. But Kunal himself is actually married to 2006's Miss India, Neha Kapur.

What else can I see him in? Dr. Cabbie, The Scribbler, Ice Age: Continental Drift

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