- "I understand mother that you were always threatened by my success and you tried to elevate yourself by denigrating me which is fine, but you are not allowed to the the same thing to my assistant who, by the way is excellent at her job."
- —Cat Grant to Katherine
Katherine Grant is the mother of Cat Grant.
Katherine visited Cat yet again and she irritated her daughter, causing Cat to take it out on Kara, however due to this Kara and Cat grew close as they went out to drinks following their argument.
Compared to her daughter, Katherine is much worse. While Cat is actually a good-hearted woman, Katherine is very hostile and arrogant.