Today in TV casting news, we're featuring two sci-movie heroines who are making the jump to the small screen. First up is Sigourney Weaver (Avatar), who will be making her TV series debut in USA's Political Animals. The Oscar-nominated actress will play Elaine Barrish, a divorced former first lady and recently-appointed Secretary of State who embraces her new job after overcoming her failed marriage and the loss of the presidential nomination.Carrie-Anne Moss (The Matrix) can also be seen on the small screen in the untitled CBS series pilot based on Ralph Lamb, a 1960s rodeo cowboy turned Las Vegas sheriff. Moss will play assistant district attorney Katharine O'Connell, the daughter of a local rancher and neighbor to the Lambs. The pilot also stars Dennis Quaid (The Day After Tomorrow) and Michael Chiklis (The Shield). Hit the jump for more on both pilots.THR reported that Weaver would be making her small screen debut in Political Animals for USA. Weaver's character will lean on Doug, her son and chief of staff, played by James Wolk (Happy Endings). Doug has his own issues as he deals with his twin brother's problems with addiction.  Written by Greg Berlanti and Laurence Mark, the six-hour long original series joins other political shows such as HBO's comedy, Veep and NBC's dysfunctional presidential family comedy, 1600 Penn in what's sure to be an entertaining election year.Deadline reported on Moss joining the untitled Ralph Lamb pilot, which was written by Nicholas Pileggi (Goodfellas) and Greg Walker and will be directed by James Mangold (Walk the Line). Quaid stars as Sheriff Lamb, while Chiklis stars as Johnny Savino, a Chicago mobster who has entrepreneurial visions for Las Vegas that clash with Lamb's ordered way of life. Moss can next be seen in the dark political film, Knife Fight and the horror-sequel, Silent Hill: Revelation 3D.