Lisa Edelstein debuted on The Good Wife this week, fighting against Will and Alicia in court and then eventually admitting she needed a new job. Will her character of Celeste Serrano join Lockhart/Gardner?

That question is not answered in the following promo, but next Sunday's episode ("Feeding the Rat") will feature Will and Diane discussing the firm's future. It will also center around Alicia's pro bono case, which takes a strange twist when a witness becomes a suspect.

Watch the official CBS trailer now: