Arrow may be the show that shes most famous for, but its in no way the only time shes appeared in a production on The CW network. She was cast as the lead actress in their reboot of the 90s TV series Melrose Place, which ran for 18 episodes before it was cancelled due to poor ratings. Cassidy, however, was praised for her performance in the show. She then went on to appear in a dozen episodes of Gossip Girl, portraying Juliet Sharp, a major antagonist in the shows fourth season. She also appeared in six episodes of Supernatural back in 2007, and one of her earliest roles was on The WBs 7th Heaven, which later switched over to The CW. Obviously shes very highly-rated by the network, and its likely shell be sticking around for a long time to come.