Feature-film star Colin Farrell makes his American primetime TV debut when he guest-stars in the January 25th episode of "Scrubs," portraying Billy Callahan, a life-loving Irishman.

Farrell stars in the title role of the epic film "Alexander," directed by Oliver Stone. Upcoming features include "The New World" and "Ask the Dust." In addition, Farrell has starred in such films as "Phone Booth," "Daredevil," "S.W.A.T.," "Veronica Guerin," "Tigerland," "The Recruit," "Minority Report," "American Outlaws" and "Hart's War." The Irish actor also starred in the BBC series "Ballykissangel."