Willa Holland will play Thea Queen, Oliver’s celebutante younger sister who’s testing the boundaries of acceptable behavior. Katie Cassidy will play Laurel, a young legal clinic attorney who shares a romantic past with Oliver in the CW's Arrow pilot. Susanna Thompson is Oliver’s mother, Moira Queen. David Ramsey is John Diggle, and Stephen Amell plays the title role.
Regular roles yet to be cast are Quentin Lance, Robert Queen, Tommy Merlyn and Walter Steele
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