Brian D’Arcy James, Bobby Steggert, John Dossett and Michele Pawk are among the thesps who will star in “Giant,” the Public Theater’s upcoming staging of the Michael John LaChiusa tuner based on the Edna Ferber novel.Kate Baldwin (“Finian’s Rainbow”), P.J. Griffith (“American Idiot”), Mary Bacon (“Harrison, TX”) and William Youmans (“Billy Elliot”) also are in the epic musical’s big cast. Multigenerational tale follows a Texas family overseen by a powerful cattle rancher. D’Arcy James (“Shrek the Musical,” “Smash”) plays the cattleman Bick, a part played by Rock Hudson in the 1956 movie version. Griffith takes on the James Dean role of a rival oil tycoon, with Baldwin as Bick’s new bride (portrayed by Elizabeth Taylor in the pic). La Chiusa (“The Wild Party,” “Queen of the Mist”) pens the music and lyrics for the tuner, with book by Sybille Pearson (“Baby”). Michael Greif (“Rent,” “Next to Normal”) directs. The Public Theater staging, with 22 actors and 17 musicians, is a co-production with Dallas Theater Center, where the show ran earlier this year. D’Arcy James, Steggert (“Ragtime”) and Pawk (“A Small Fire”) are among those new to the title. Show begins previews at the Public Oct. 26 ahead of a Nov. 13 opening.