I thought it would be fun to find the early, if not the earliest, acting clips/pics of The Big Bang Theory’s cast.
Johnny Galecki (Leonard)
Had been professionally acting for about two years when he appeared as Rusty in National Lampoon’s Christmas Vacation. He would have been roughly 14 years old.
Jim Parsons (Sheldon)
First appeared on screen in the sitcom, Ed in 2002 where he played Chet in an episode titled, “The Road.” He shared the screen with Julie Bowen from Modern Family and John Slattery from Mad Men.
Kaley Cuoco-Sweeting (Penny)
According to her imdb.com page, was roughly seven years old when she made her acting debut in a TV movie, Quicksand: No Escape. In the clip below, a nine year old Kaley in My So-Called Life playing a younger version of Angela Chase, the character played by Clare Danes.
Simon Helberg (Howard)
Appeared briefly in 2002’s Van Wilder. It was his fourth movie appearance.
Kunal Nayyar (Raj)
Played Youssef Zidan, a terrorist, in a 2007 episode of N.C.I.S.
Melissa Rauch (Bernadette)
Appeared as Tina on the sitcom Kath and Kim in 2008.
Mayim Bialik (Amy)
Played a younger version of Bette Midler’s character, CC, in the 1988 film, Beaches.