Cold case "Cropsey" (8 p.m. Friday, Investigation Discovery) looks at one of New York's most disturbing unsolved mysteries, involving the disappearance of five children, including a 13-year-old girl with Down Syndrome. Were the crimes really masterminded by a homeless man or was he a scapegoat?

Ain't they sweet? More than one cable exec must have a sweet tooth. "Cupcake Girls" (8 p.m. Saturday, WE) is the latest reality series to revolve around baked goods, a subject that rarely lends itself to rich drama. In this one, we're asked to care about Heather and Lori's attempts to deliver their wedding cakes on time.

Dora's day Dora the Explorer is celebrating her 10th year on the air with a star-studded party. "Dora's Big Birthday Adventure" (7 p.m. Sunday, Nick) includes contributions from Rosie Perez, John Leguizamo and Hector Elizondo. As a special present, Dora gets to stay up past her bedtime for a documentary (8 p.m.) that explores her contributions to children's television. Among those weighing in: Famed educators Shakira, Elisabeth Hasselbeck and Salma Hayek Pinault.

Knight ribber Poking fun at David Hasselhoff is like shooting fish in a barrel: It's not that hard and it promises to be bloody. Still, we can't resist watching Pamela Anderson, Jerry Springer and Hulk Hogan take aim during "The Roast of David Hasselhoff" (9 p.m. Sunday, Comedy). Dinner will be served on the floor.

NEAL JUSTIN