Fallen Angel

S4, E6: The Angels are retained by opera star Carla Taggart to protect her Blue Heron Diamond from the ice cat jewel thief, Damien Roth. However, Jill Munroe (Farrah Fawcett) has become romantically involved with Roth, who invites her to participate in the heist. The Angels are highly suspicious of Jill and decide to capture the thief and his accomplice. While the Angels gather for Miss Taggart's dress rehearsal, Roth and Jill steal into the dressing room where they find a giant cobra guarding the diamond. Roth carefully snatches the rock and they make their getaway. They reach the rooftop and Jill and Roth fight when she reveals she's a cop. The Angel appear in time to rescue her and she reveals that Charlie thought it essential that she portray a traitor to the Angels in order to gain the thief's confidence.