THERE ARE “billions and billions” of reasons to embrace smart TV. Now in its third season and 40 years removed from the seminal documentary series it honors, “Cosmos: Possible Worlds” (8 p.m., National Geographic) continues the visionary efforts of astronomer, cosmologist, author and television legend Carl Sagan (1934-’96).

Neil deGrasse Tyson returns to host this eye-popping, speculative effort that blends special effects, animation and historical reenactments. “Possible Worlds” sets out a theoretical response to Sagan’s own questions about where mankind might travel in the 21st century and how that exploration might change science, culture and human nature itself.

The “Cosmos” production team includes Seth MacFarlane of “Family Guy” fame. He also appears in historical reenactments, portraying president Harry Truman. A second episode (9 p.m.) follows.

• Available to Spectrum subscribers on their On Demand platform, the U.K. import “Temple” is a gripping medical mystery. Mark Strong (“Zero Dark Thirty,” “Sherlock Holmes”) stars as Dr. Daniel Milton, a highly respected surgeon haunted by the apparent suicide of his wife. Most of his friends and family attribute his distracted air to grief. But he’s actually established a secret surgical laboratory under the Temple Underground station.

It’s unfair to reveal much more, but some of this curious double life involves him in work as a go-to doctor for the criminal underworld. Just how long he can maintain this secret practice is the mystery of this eight-episode series.

• Another medical-themed mystery, “Blood” streams its second season on Acorn. This acclaimed Irish series stars Adrian Dunbar (“The Crying Game”) as a doctor suspected in his wife’s “accidental” death. This accusation costs him his practice and estranges him from his adult children.

• Owen and the crew must contend with a gender reveal-party gone amok on “9-1-1: Lone Star” (8 p.m., Fox, TV-14). Gender roles and expectations loom large on this Ryan Murphy-produced series.

The two-hour season finale combines the series ninth and 10th episodes. Back in the day, a mid-season series yanked after 10 episodes was considered toast, but these are different times. The original procedural, “9-1-1,” is all but certain to return.

Other season finales

• A change in the school’s status on “All American” (8 p.m., CW, TV-14).

• Gravedigger gathers his dark forces on “Black Lightning” (9 p.m., CW, TV-14).

• The Vatican prepares for battle on “The New Pope” (9 p.m., HBO, TV-MA).

• As their trial nears, some consider a plea deal on “McMillion$” (10 p.m., HBO, TV-14).

Other highlights

• Blind auditions continue on “The Voice” (8 p.m., NBC, TV-PG).

• The first installment of the two-part live season finale has “The Bachelor” (8 p.m., ABC, TV-14) action move to Alice Springs, Australia.

• Don Wildman examines a haunted house and a statue with a ghostly backstory on “Beyond the Unknown” (8 p.m., Travel, TV-PG).

• A Facebook post inspires a woman to get back in touch with the child she gave up for adoption in the 2018 shocker “Psycho Daughter” (8 p.m., LMN, TV-14).

• A glum couple (Michelle Williams and Ryan Gosling) watch their marriage dissolve in the 2010 drama “Blue Valentine” (8 p.m., TMC). If that doesn’t scare you off relationships, you can follow that up with “Fatal Attraction” (10 p.m., TMC).

• A colleague’s secret haunts Lola on “All Rise” (9 p.m., CBS, TV-14).

• As Saul, Jimmy mulls a new proposition on “Better Call Saul” (9 p.m., AMC, TV-MA).

• A kidnapper’s motivations may prove mitigating on “Bull” (10 p.m., CBS, TV-14).

• The meaning of an ancient manuscript may be crucial on “Manifest” (10 p.m., NBC, TV-PG).

• Life is short on “The Good Doctor” (10 p.m., ABC, TV-14).

• Veterans risk much to criticize the drone war in the repeat 2016 “Independent Lens” (10 p.m., PBS, TV-14, check local listings) documentary “National Bird.” This film can also be streamed at any time on Netflix.

• The gang meets Octavio in the flesh on “Dispatches From Elsewhere” (10 p.m., AMC, TV-14).

Cult choice

Few actors have been as frank about the horrible movies they’ve done as Michael Caine. His stinkers certainly include the 1979 disaster sequel “Beyond the Poseidon Adventure” (3:30 p.m., TCM), co-starring fellow double Oscar-winner Sally Field. Both also appeared in the 1987 comedy “Surrender.” It didn’t involve a shipwreck, but it did co-star Steve Guttenberg.

Series notes

Calvin’s commercial unravels on “The Neighborhood” (8 p.m., CBS, TV-PG) ... Pew research on “Bob Hearts Abishola” (8:30 p.m., CBS, TV-PG).

Late night

John Krasinski and Rachael & Vilray sit down on “The Late Show With Stephen Colbert” (11:35 p.m., CBS) ... Jimmy Fallon welcomes Alex Rodriguez, KJ Apa and HAIM on “The Tonight Show” (11:35 p.m., NBC) ... Nicole Wallace, Rupert Everett, Daymond John and Steve Ferrone visit “Late Night With Seth Meyers” (12:35 a.m., NBC).