The Adventures of Brisco County, Jr. S01E05 - Socrates' Sister

Brisco manages to capture Jack Randolph, one of Bly's gang. However, he claims to be a different Jack Randolph. Socrates' sister Iphigenia arrives to defend him, and it turns out she was also in a romantic correspondence with him. Randolph is the real Randolph, and uses Iphigenia to break out and try to recover stolen treasure in a submerged town.