“Million Dollar Password” (8 p.m., CBS): Regis Philbin returns as host.

“Million Dollar Password” (8 p.m., CBS): Regis Philbin returns as host.

“The Tudors” (9 p.m., Showtime): The season wraps up, and the king is still skinny.

“National Memorial Day Concert” (9 p.m., PBS): Gary Sinise and Joe Mantegna host. Scheduled to appear: Colin Powell, actors Katie Holmes, Dianne Wiest and Laurence Fishburne, and singers Katharine McPhee and Trace Adkins.

“Diamonds” (9 p.m., ABC): “Diamonds” are hardly a girl’s best friend in this two-part TV movie. Judy Davis stars. Concludes Tuesday.