CTV has added the fourth season of Nip/Tuck to its weekend schedule and to its broadband site. The fourth season (15 x 60) of the plastic surgery series will air on the main network in two different timeslots starting March 3 — Saturdays at 10 p.m. in Alberta and Atlantic Canada and Sundays at 10:00pm in the rest of the country.

The odd scheduling is due to the show’s graphic content which, if simulcast, would put it on air uncomfortably early out west, says a network spokesperson.

The FX series replaces Law & Order: Criminal Intent in Alberta and on the East Coast, and Studio 60 on the Sunset Strip, which is now on hiatus, in the rest of the country. The scheduling leaves CTV with a formidable Sunday lineup, which also includes The Amazing Race and Desperate Housewives.

New eps of Nip/Tuck will also be posted on CTV’s broadband site on Monday mornings.

In related scheduling news, Global and NBC have set a date for the debut of The Black Donnellys, which will push aside Heroes to air Mondays at 10 p.m. starting Feb. 26.

The much-anticipated crime series — exec produced and directed by Paul Haggis (Crash) — follows four brothers through the New York underworld, taking its name from the infamous clan that lived in his hometown of London, ON in the 1800s. It will follow 24 and Prison Beak.

No word yet where super-powered Heroes, also from NBC, will land.