Series
On Homicide (10 p.m. Fri., NBC), Sheppard and Ballard partner to investigate the murder of a female gang member. The Pretender and Profiler begin a three-hour crossover season finale (9 p.m. Sat., NBC). On the season-ending episode of Martial Law (9 p.m. Sat., CBS), Sammo swears vengeance on the evil Lee Hei for Master Reng's death. Cuba Gooding Jr. hosts Saturday Night Live (11:30 p.m. Sat., NBC) with music from the muy caliente Ricky Martin. Stephen Hawking makes a voice cameo on an episode of The Simpsons (8 p.m. Sun., Fox) in which Lisa is inducted into the Springfield chapter of Mensa. Muhammad Ali guests as himself on Touched by an Angel (8 p.m. Sun., CBS). Mulder has an alien epiphany in a cave on The X-Files (9 p.m. Sun., Fox). Masterpiece Theatre (check local times, Sun., PBS) begins a two-part adaptation of Charles Dickens' "Great Expectations," starring Ioan Gruffudd as Pip and Charlotte Rampling as Miss Havisham. One of the partners is brutally attacked on the season finale of The Practice (10 p.m. Sun., ABC).
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Specials
The "National Geographic" special Avalanche: The White Death (8 p.m. Sat., NBC) is a testament to the awesome power of moving snow. Sigourney Weaver hosts Why Dogs Smile and Chimpanzees Cry (8 p.m. Sun., Discovery Channel), a look at the emotional lives of animals. The new TV movie The Hunt for the Unicorn Killer (9 p.m. Sun., NBC) is the story of '60s activist Ira Einhorn, who fled to France after murdering his girlfriend, and the girl's father's efforts to have him extradited to stand trial. Tom Skerritt and Kevin Anderson star. Sidney Poitier plays a humble farmer who stands his ground when developers want to buy his land in the new TV movie The Simple Life of Noah Dearborn (9 p.m. Sun., CBS). With Dianne Wiest and Mary-Louise Parker.
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Sports
NHL playoffs, conference semifinals:
Penguins at Maple Leafs, Game 1 (7 p.m. Fri., ESPN2); Game 2 (7 p.m. Sun., ESPN2)
Red Wings at Avalanche, Game 1 (7:30 p.m. Fri., ESPN); Game 2 (2 p.m., Sun., Fox, regional)
Blues at Stars, Game 2 (7:30 p.m. Sat., ESPN)
Sabres at Bruins, Game 2 (2 p.m. Sun., Fox, regional)
Baseball:
Braves at Padres (10 p.m. Fri., Sat., TBS; 4 p.m. Sun., TBS)
Angels at Red Sox (1 p.m. Sat., FX)
Rangers at Blue Jays (8 p.m. Sun., ESPN)
NBA playoffs, conference quarterfinals:
Knicks at Heat, Game 1 (12:30 p.m. Sat., NBC)
Suns at Trail Blazers, Game 1 (3 p.m. Sat., NBC)
Kings at Jazz, Game 1 (5:30 p.m. Sat., NBC)
Pistons at Hawks, Game 1 (8:30 p.m. Sat., TNT)
76ers at Magic, Game 1 (12:30 p.m. Sun., NBC)
Timberwolves at Spurs, Game 1 (3 p.m. Sun., NBC)
Rockets at Lakers, Game 1 (5:30 p.m. Sun., NBC)
Bucks at Pacers, Game 1 (8:30 p.m. Sun., TNT)
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Talk
Rosie O'Donnell (syndicated) Third anniversary show
David Letterman (CBS) Kelsey Grammer, Chamique Holdsclaw, Steve Earle
Jay Leno (NBC) Dylan McDermott, Keri Russell, the Corrs
Charlie Rose (PBS) David Guterson, Brendan Fraser
Dennis Miller (HBO) Ray Romano
Politically Incorrect (ABC) Snoop Dogg, Michael Medved
Conan O'Brien (NBC) Harvey Keitel, Patty Griffin
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