S7, E18: After being accused of murder and having her criminal past exposed, Laurel goes full Black Siren and teams up with an old criminal acquaintance, Shadow Thief (guest star CARMEL AMIT), to go on a crime spree around Star City. While Dinah aims to bring Laurel in, Felicity refuses to give up on her friend and tries everything to get through to her, even summoning Sara Lance (special guest star CAITY LOTZ) for help. However, Laurel rebuffs all her efforts, forcing the former friends to face off against each other.