The ladies perform in the “Wedding” episode of Glee airing Friday, Feb. 20. (Adam Rose/FOX)

(All times Eastern)

FINALE WATCH: Amidst doubts about its staying power and multiple controversies, “Undercover Boss” (CBS at 8 p.m.) wraps up its sixth season with the chief executive of Vivint, a smart home technology company, going undercover.

SERIES PREMIERE: A spinoff of the network’s “Preachers of L.A.,” “Preachers of Detroit” (Oxygen at 8) features seven ministers and their lives in and out of the pulpit.

Missed that exhaustive “Saturday Night Live” special Sunday? Well, you’re in luck. “SNL 40th Anniversary Special” (NBC at 8) re-airs, with highlights such as Betty White planting one on Bradley Cooper, Jane Curtin reclaiming “Weekend Update” and Chevy Chase being Chevy Chase.

“American Masters: August Wilson — The Ground On Which I Stand” (MPT at 9, WETA at 9:30) reflects on the life and works of the esteemed “Fences” and “The Piano Lesson” playwright through insights from family, friends and actors including Viola Davis, James Earl Jones and Laurence Fishburne.

High school sweethearts Santana Lopez and Brittany S. Pierce finally say “I do” on “Glee” (Fox at 9) in a ceremony attended by Gloria Estefan, Jennifer Coolidge, Ken Jeong and Gina Gershon.

SERIES PREMIERE: “Insane Pools: Off the Deep End” (Animal Planet at 9) follows award-winning pool designer Lucas Congdon and his to-die-for designs.

SERIES PREMIERE: Hosted by Louise Roe and Preston Konrad, “Style By Jury” (TLC at 9:30) brings in fashion crimes “repeat offenders” who face judgment from a jury of their peers — and then are sentenced to makeovers.

Baez is held hostage in an interrogation room after serving a distraught man with a restraining order on “Blue Bloods” (CBS at 10).

“Real Time With Bill Maher” (HBO at 10) hosts musician Aloe Blacc, author Fran Lebowitz, The Washington Post’s Elahe Izadi, science educator Bill Nye and film director Rob Reiner.

Actor Kevin Bacon and American treasure Amy Sedaris are on “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), with musical guest Nick Jonas.

Actor Sean Hayes comes to the “Late Show With David Letterman” (CBS at 11:35), with kid scientists and music from Judah and the Lion.

Actors David Spade and Randall Park stop by in a repeat of “Jimmy Kimmel Live” (ABC at 11:35), with a performance from the Band Perry.

Rachel Lubitz