The Bachelor (7 p.m., Ch. 4): Jennifer and Rachel get one-on-one dates.
Who's Still Standing (7 p.m., Ch. 5): A Los Angeles teacher competes against 10 opponents in a trivia battle for $1 million.
House (7 p.m., Ch. 13): An Alzheimer's patient participating in a drug trial suffers from a violent temper.
Fear Factor (8 p.m., Ch. 5): Teams of twins face challenges including racing through an electrified maze suspended over water, eating something gross and racing on a moving train.
Alcatraz (8 p.m., Ch. 13): The team races against time to capture a child killer.
Hawaii Five-0 (9 p.m., Ch. 2): Lori Weston joins the Five-0.
Castle (9 p.m., Ch. 4): The investigation into the death of a famous dog trainer leads to a reality-TV star.