Believe it or not, there's talk about a sequel to "Mrs. Doubtfire," more than 20 years after the original. Robin Williams might have to spend a little more time in makeup if he's going to return as the beloved caretaker. Rewatch the 1993 comedy to see if it merits another spin. 7 p.m. Hub
You better, you bet
Pete Townshend may no longer be a force on the pop charts, but he's still hip enough to associate himself with one of TV's coolest shows. The Who guitarist teamed up with composer Nathan Barr for "It Must Be Done," which will be featured on a new episode of "The Americans." It's the first time Townshend has written for the small screen. 9 p.m. FX
Weapons of mass destruction
"Nazi Mega Weapons" takes a look at some of Adolf Hitler's wildest ideas, including a land battleship that, if actually created, would have weighed 1,000 tons. This program is part of a six-part series that also looks at Fortress Berlin, U-boat pens and the Atlantic Wall. 9 p.m. TPT, Ch. 2.