FRIDAY, 3/30 * The Magic of David Copperfield XII: The Niagara Falls Challenge Anybody who has ever wanted to throw David Copperfield down a 167-foot waterfall will want to catch his latest special, in which he floats toward the edge of Niagara Falls chained to a raft. A death-defying escape is promised. CBS (8-9 p.m.)
* Sugar and Spice Welcome to My Two Moms: Two sisters (Loretta Devine and Vickilyn Reynolds) who can't agree on anything squabble over the upbringing of their teenage niece in a comedy seeies beginning its run tonight. CBS (9:30-10 p.m.)
* Great Performances: Dance in America Maria Tallchief, Darci Kistler, and others reminisce about their tutelage under George Balanchine in ''Dancing for Mr. B: Six Balanchine Ballerinas.'' PBS (9-10:30 p.m.)
* Keith Haring: Drawing the Line An appreciation of the late pop artist's work, with commentary by Haring aficionado Dennis Hopper and art dealer Leo Castelli. First shown in 1989. PBS (10:30-11 p.m.)
SATURDAY, 3/31 * Columbo A very personal case for the rumpled one as a deranged woman (Helen Shaver) marks Mrs. Columbo (as invisible as ever) for murder. ABC (9-11 p.m.) * Stand-Up Spotlight Rosie O'Donnell's showcase for established and up-and-coming comedy club talent-the Carson bench warmers of tomorrow. This week's auditioners: Susan Norfleet, Jordan Brady, and Jack Gallagher. VH-1 (11-11:30 p.m.)
SUNDAY, 4/1 * HA! The TV Comedy Network Live from New York-it's Saturday Night reruns! A new cable channel of round- the-clock comedy begins its programming with a segment of SNL from the Eddie Murphy era (See specialty column, page 15). (7 p.m. on)
* The Simpsons Tormented by a school bully, Bart stages a full-scale multiple-water-balloon retaliation. Don't miss his hilarious public service message. Fo Fo8:30-9 p.m.)
* Movie: The Girl Who Came Between Them A Vietnam veteran (Anthony John Denison) and his wife (Cheryl Ladd) must adjust to the arrival of his illegitimate daughter in the United States. NBC (9-11 p.m.)
* Movie: Too Young the Hero The movie in which Ricky Schroder became a man, or at least a Rick: He plays Calvin Graham, an underage enlistee in World War II who became a hero only to be wrongly accused of desertion. CBS (9-11 p.m.) B-
* Movie: Octopussy James Bond (Roger Moore, in 1983) is entrapped in the tentacles of Maud Adams in a speedy, long-on-comedy installment of 007's adventures. ABC (9-11:30 p.m.) B+
MONDAY, 4/2 * Movie: The Last Fling A bride-to-be seeks a final romp before settling into marriage. The flinger: Connie Sellecca. The flingee: John Ritter. First shown in 1987. ABC (8-10 p.m.)
* Movie: Follow Your Heart An American soldier (Patrick Cassidy) and a little Vietnamese girl (Nichole Francois) comfort each other in postwar America. Not a repeat of last night's movie, but an incredible simulation. NBC (9-11 p.m.)


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