The star unsuccessfully auditioned for the original female lead of the unaired pilot called Katie (Amanda Walsh), who is worlds away from Penny.
Katie was reportedly a saleswoman who worked at the cosmetics counter of a local department store.
She was described as “a street-hardened, tough-as-nails woman with a vulnerable interior”.
When speaking about the character, Kaley described Katie as “a dark, brooding unhappy woman”, the very opposite to the cheerful Penny who moved in opposite apartment 4A in episode one.
The Big Bang Theory season 12 is available to stream on Netflix.