Scheduled for the weeks of March 31-April 13. All listings are Eastern time and are subject to change.
ROBERT STACK (www.NBC.com, 9 p.m.) The Unsolved Mysteries host unravels some mysteries for fans.
JENNA LEIGH GREEN (America Online, Keyword: ABC Kidzine, 4 p.m.) Sabrina, the Teenage Witch‘s Libby sounds off on her bad-girl role.
CINDY MARGOLIS (AOL, Keyword: Extra, 10 p.m.) Pinup babe dishes on Mike Myers’ upcoming Austin Powers.
HOWIE MANDEL (AOL, Keyword: Olds, 10 p.m.) Comic previews The HBO Comedy Hour: Howie Mandel on Ice.