In honor of tonight's "The Big Bang Theory" season finale, let's throw it back to the '90s and revisit the early work of its now-famous cast.

Johnny Galecki and Kaley Cuoco now star on one of the biggest sit-coms ever, but before they became Penny and Leonard, they landed some TV guest spots as kids that will live forever in the land of re-runs and the internet.

Young Kaley can be found in an episode of "Northern Exposure," the Alaska-based early '90s series starring Rob Morrow and John Corbett. Isn't she just the cutest little thing?

And, in 1991, Johnny made an appearance on coming-of-age sit-com "Blossom," a show that happened to star another "Big Bang" actress, Miyam Bialik. Two throwbacks for the price of one!

The Big Bang Theory TV Show Poster
The Big Bang Theory
CBSTVPGSeptember 24, 2007
Based on 23 critics

Physicists and best friends Leonard and Sheldon learn about the social aspects of life through their relationships with the free-spirited beauty who moves in next door. Read More

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