Royal wedding

Will young viewers sacrifice an hour of prime time to take in a history lesson? Maybe — if it's about romancing a teenage Mary Stuart. I predict the new drama "Reign" (8 p.m., WUCW, Ch. 23) will have a rough time, unless they throw in a couple of vampires.

Be prepared

It's the end of the world as they know it, and they feel … prepared. "Apocalypse Preppers" (8 p.m., Discovery) looks at how extremists are getting ready for another Black Plague, an alien invasion or a robot rebellion. No one, however, is prepped for the rapid growth of the Kardashian family.

The empire's new clothes

"Project Runway" (8 p.m., Lifetime) winds up its 14th season by crowning a new champion, which reminds me: Maybe it's time I bought a third pair of underwear.

Neal Justin