The sixth season of "Oz" — the acclaimed jailhouse series — premieres on Sunday, Jan. 5 at 9 PM ET on HBO. The final season of the gritty series will feature performances from several Tony Award winners. In addition to Rita Moreno and B.D. Wong, who are series regulars, the sixth season will boast Tony winners Betty Buckley, who returns to her role as Suzanne Fitzgerald, an inmate's mother; Patti LuPone, who will play an archivist in the prison library; Phyllis Newman, who portrays a U.S. Senator in the final episode; and Joel Grey, who will appear as one of the Oz inmates.

Among the many other theatre stars who have appeared on the celebrated series are Brian F. O'Byrne, Milo O'Shea, Austin Pendleton, Ben Vereen, Mary Alice, Patrick Breen, Charles Busch, Philip Casnoff and Frankie and Johnnie's Edie Falco. For more information, go to www.hbo.com.

—By Andrew Gans