What to Watch: Nunsense on House, XIII Spies U.S. Debut, Gravity Falls' Monster Mash and More

On TV this Friday: A memorable House call, the Common Lawmen engage in role play, XIII‘s number is up and Gravity Falls and Chasing UFOs know the truth is out there (but go about finding it in very different ways). Here are eight programs to keep on your radar.

8 pm House (Fox) | It’s all Chase, all the time in this Repeat to Revisit, when Princeton Plainsboro’s [spoiler alert!] future Head of Diagnostics returns to work after his stabbing and treats a pretty nun.

8:30 pm House Hunters on Vacation (HGTV) | A Minnesota family who’s never been far from home travels to Kaui and chooses from three dream vacation homes there. (They should totally stop by Postcards Café in Hanalei, because the food there is awesome.)

RELATED | Hot for Summer: 100 Premiere Dates and More!

9 pm XIII: The Series (Reelz) | No, it’s not the Olivia Wilde House spin-off Matt Mitovich has been pining for. Rather, this series — which has already aired in Canada — concerns a former CIA operative (Night Stalker‘s Stuart Townsend) who wakes up with a new face, no memory, mad spy skills and a tattoo of Matt Damon the titular Roman numeral. Understandably, he wants answers. Aisha Tyler (The Talk) co-stars.

9 pm Whale Wars (Animal Planet) | As the Sea Shepherd Conservation Society continues its efforts to end Japanese whaling, Captain Paul Watson sends a team to board a heavily armed security ship while the Brigitte Bardot’s crew hustles to evacuate its ailing vessel.

9 pm Chasing UFOs (NatGeo) | Series premiere: Wannabe Mulders and Scullys will want to check out this Ghost Hunters-type show about a team that investigates alleged extraterrestrial activity.

9 pm Tyler Perry’s House of Payne (TBS) | It’s a rough night for Calvin: In back-to-back episodes, he gets suspended at work and then has a pregnancy scare with Miranda.

9:30 pm Gravity Falls (Disney) | In the official premiere of this animated series, twins Dipper (voiced by Parenthood’s Jason Ritter) and Mabel (30 Rock’s Kristen Schaal) set out to prove that a legendary sea monster exists at the bottom of a local lake.

RELATED | Fall TV: Your Guide to What’s New!

10 pm Common Law (USA Network) | Dr. Ryan has Wes and Travis engage in role play, which sounds far kinkier than it plays out. But it works: The exercise helps them solve the case of a woman who was strangled to death.

Which of the above is must-see for you? Also, hit Comments to offer your own tune-in suggestions.

GET MORE: Premieres, Previews, What to Watch