The only characters retained in both pilots were Leonard (Johnny Galecki) and Sheldon (Jim Parsons), who are named after Sheldon Leonard.
Althea (Vernee Watson) was a character featured in both pilots and the first series episode.
Begin slideshow Kaley Cuoco and Johnny Galecki dated for two years while working on the show! “It was a wonderful relationship but we never spoke a word about it and never went anywhere together.
Test audiences reacted negatively to Katie, but they liked Sheldon and Leonard.
No, those rumors of "Big Bang Theory" co-stars Kaley Cuoco and Johnny Galecki dating aren't true.
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