Dr. Horrible’s Sing-Along Blog 9 p.m., Channel 56
Have you seen this 2008 online classic, from Joss Whedon? Tonight, it’s making its broadcast debut. The musical is about a wannabe supervillain played by Neil Patrick Harris (pictured), his nemesis, Captain Hammer (Nathan Fillion, a.k.a. “Castle”), and their shared love interest, Penny (Felicia Day). This is must-see, and Whedon has announced that production on a sequel will begin next spring.
Prank My Mom 10 and 10:30 p.m., Lifetime
The title tells it like it is. This new candid camera series pushes mothers to the brink of nervous breakdowns for your viewing pleasure. One prank has mothers seeing their kids get fake-arrested; another has kids telling their mothers that they’re going to sell their sperm. Good times. Vivica A. Fox hosts.
The Big Jig 10 p.m., TLC
Includes: kids, Irish dance. Doesn’t include: me watching.
Raising Hope 8 p.m., Channel 25
Maw Maw mia.
Go On 9 p.m., Channel 7
Ryan is eating too much. He’s Team Fat Monica.Matthew Gilbert can be reached at email@example.com. Follow him on Twitter @MatthewGilbert.