"When I read the script I was so excited," the actress, a veteran of "Gossip Girl" and "Melrose Place," told AccessHollywood.com at Comic-Con 2012 in San Diego.
Katie - who sports a brunette hue instead of her usual blond locks in the show - said she waited for one piece to fall into place - Stephen Amell being chosen for the title role of Arrow/Oliver Queen, before signing on.
"They hadn't cast the ...
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