Friday on TV

Ghost Whisperer (7 p.m., Ch. 2): A family's secret threatens to destroy them.

Men's college volleyball (7 p.m., BYUTV): Pacific at BYU

Sanctuary (7 and 9 p.m., Syfy): In the two-hour, second-season finale, Will disappears; Magnus uncovers information about the Cult of Kali.

Medium (8 p.m., Ch. 2): Davalos struggles on the anniversary of his daughter's death.

This Emotional Life (8 p.m., Ch. 7): Relationships are vital to emotional health.

Dollhouse (8 p.m., Ch. 13): Echo and her crew set out to destroy Rossum Corp.'s mainframe.

Numb3rs (9 p.m., Ch. 2): A missing shipment of guns is linked to a series of murders.