TV THIS WEEK: Constantine's finale, Grand Moff Tarkin on Rebels, and more

It's a sad week if you're a fan of Constantine. Its initial 13-episode run is up on Friday, and we still don't know if the show will survive. On the bright side, though, we do get another showdown with Papa Midnite. Plus, Grand Moff Tarkin arrives on Star Wars Rebels, Firestorm goes nuclear on The Flash, and more.

Check out the week in TV below. What's on your watchlist?

Highlights of the Week 

Star Wars Rebels (Disney XD) Monday, 9 p.m. - "Call to Action"

Rebels has done well enough so far that it got a second season renewal very shortly after its premiere, and as a further vote of confidence, Disney has apparently granted the show a much larger episode order for season two. Like Clone Wars before it, it's a show that succeeds by both drawing on the familiar of Star Wars and establishing its own storytelling style (it's Star Wars, but it's not George Lucas, shall we say), and that's something that should serve it well as we move deeper into the Disney era. Since the premiere of its regular episode run on Disney XD, which pulled in just slightly more than 1 million viewers, the show's Live+Same Day numbers have stuck steadfastly below 1 million, but the numbers are still strong for Disney XD, and the show's creators definitely seem to be in it for the long haul. We know this because the show is increasingly mixing up its original characters with the cast of the original Star Wars trilogy, and this week the villainous Grand Moff Tarkin joins the action. Tarkin's not exactly the most thrilling crossover character so far (that honor would probably go to Yoda), but it is still fun to see how the show blends its own story with what will eventually happen in A New Hope. This week, as they get more public exposure, the Rebels go after an important Imperial network. Check out a preview below.

The Flash (CW) Tuesday, 8 p.m. - "The Nuclear Man"

I've talked before about how I admire how quickly The Flash has jumped into the clear comic-book zaniness of its source material. It took a little longer for Arrow to get there, and that works because Arrow very clearly translates to the grim vigilante aesthetic if you want to swing that way, but The Flash brought us a rogue like Weather Wizard right out of the gate, and it still (pun intended) hasn't slowed down. Last week the show moved its Gorilla Grodd development forward, and continued its F.I.R.E.S.T.O.R.M storyline, and this week that particular arc looks primed to go nuclear. When Ronnie attacks a physicist, Barry hopes that Dr. Martin Stein can help track him down. Meanwhile, Barry must balance his superhero duties with his budding romance. Check out a preview below.

Arrow (CW) Wednesday, 8 p.m. - "Canaries"

Though its titular hero is obviously the star, Arrow thrives when it embraces the team dynamic of its storytelling, when Felicity and Roy and Diggle and Laurel get their moments, and that dynamic took on new weight over the last few weeks as the rest of the team dealt with Oliver's absence from Starling City. Now he's back, and he and the team both have to reckon with what happened while he was away, particularly (this week, at least) the continued development of Laurel into Black Canary. The show was already bigger than Oliver, and Laurel's rise both reinforces that and has the potential to take Arrow to new heights of superhero team-up bliss. This week, though, Laurel faces a major test when she faces Vertigo. Check out a preview below.

The Vampire Diaries (CW) Thursday, 8 p.m. - "Stay"

For several seasons, The Vampire Diaries was a reliable ratings machine for The CW, riding the same cultural wave that propelled Twilight and True Blood to their highest highs. The show is now in its sixth season, it still has many devotees, and a seventh season has already been ordered, but we may already be seeing signs of the show fading away. Before its fifth season, the show had never dropped below 2 million Live+Same Day viewers, but by the end of that season it had delivered six straight episodes, including the season finale, which did just that. This season, with 13 episodes under its belt, the show has not once broken the 2 million mark in Live+Same Day. Now, obviously those numbers are still solid for The CW, and the network obviously agrees the show is still viable since it's ordered a seventh year, but it seems like it's time to wonder whether the show will make it to season eight. That's not to say that it can't. After all, Supernatural experienced a similar slump with its seventh season, and look where that show is now. It's quite possible that The Vampire Diaries could keep running as long as its stars and its writers want it to, but for the moment we also have to watch and wait and see if this ratings decline continues into next fall.

Constantine (NBC) Friday, 8 p.m. - "Waiting for the Man"

Season finale! - We have reached the inevitable moment many Constantine fans have been dreading: the final episode in the show's original 13-hour order. The show didn't perform well right out of the gate, despite the lead-in from Grimm, and though it's been consistent in its ratings -- bringing in between 3 and 3.5 million Live+Same Day viewers per episode -- it just hasn't been performing that well for NBC. Network executives noted when they didn't order nine more episodes of the series that the decision did not mean the show was canceled, and they've yet to make a decision either way, but many fans fear this is the end, and a Save Constantine campaign is still ongoing. The good news is that, while its numbers were never that big, Constantine has delivered a consistent audience for NBC, rather than slipping further and further into ratings oblivion, so there's a chance that the network will take a wait-and-see approach similar to what they did with Bryan Fuller's Hannibal. Plus, a new rumor has surfaced that the show could wind up on NBC's sister network Syfy, where it might have a chance to get darker and scarier in front of a cable audience. As we face the final episode of season one, Constantine's future is uncertain, but it definitely doesn't seem to be nonexistent. Not yet. This week, John and Zed return to New Orleans, and Papa Midnite is after revenge. Check out a preview below.

Monday, February 9

Gotham (FOX) 8 p.m. - "The Scarecrow"

Gordon and Bullock hunt Gerald Crane, a biology teacher who harvests the glands of his murder victims. Meanwhile, Mooney continues her plot to gain power; Bruce takes a treacherous hike; and Falcone tries to change Maroni's plan for the Penguin.

The Originals (CW) 8 p.m. - "The Devil is Damned"

Vincent joins forces with a powerful figure from his past; Klaus reluctantly places his trust in his siblings to protect Hope; Kaleb is forced to make a difficult life or death decision; Elijah fights for his life when an unexpected visitor arrives at the safe house; Hayley and Jackson prepare for the unification ritual but quickly become pawns in Vincent's dangerous plan.

Sleepy Hollow (FOX) 9 p.m. - "What Lies Beneath"

A Thomas Jefferson encounter is a highlight during Ichabod and Abbie's quest to fight evil; Jenny learns a secret about Frank.

Star Wars Rebels (Disney XD) 9 p.m. - "Call to Action"

Read more in our Highlights section above.

Scorpion (CBS) 9 p.m. - "Love Boat"

Team Scorpion work undercover on a cruise ship to locate and disable stolen rockets. Meanwhile, Toby and Happy help Ralph deal with his first crush, as Valentine's Day approaches.

Tuesday, February 10

The Flash (CW) 8 p.m. - "The Nuclear Man"

Read more in our Highlights section above.

Face Off (Syfy) 9 p.m. - "Sounding Off"

The artists design creatures based on unique sound effects provided to them by Erik Aadahl.

Agent Carter (ABC) 9 p.m. - "A Sin to Err"

Peggy uncovers the truth about Leviathan.

Supernatural (CW) 9 p.m. - "Halt & Catch Fire"

Sam and Dean try to stop a ghost who is taking revenge against a group of college students by killing people through various electronic devices.

Forever (ABC) 10 p.m. - "The King of Columbus Circle"

Henry and Jo investigate the death of an exiled king.

Person of Interest (CBS) 10 p.m. - "Guilty"

Finch suspects that a fellow juror is trying to rig the proceedings in a murder trial. Meanwhile, Reese begins to open up to the department's therapist.

Wednesday, February 11

Arrow (CW) 8 p.m. - "Canaries"

Read more in our Highlights section above.

The 100 (CW) 9 p.m. - "Rubicon"

Tensions between Clarke and Abby come to a head. Meanwhile, Raven helps Bellamy navigate Mount Weather; and Jaha and Murphy encounter a stranger.

Thursday, February 12

Teen Titans Go! (TOON) 6 p.m. - "Real Boy Adventures"

Cyborg discovers what it's like to be human.

Steven Universe (TOON) 6:30 p.m. - "Beach City Horror Club"

Ronaldo has paranormal theories about Beach City.

Adventure Time (TOON) 7:30 p.m. - "The Mountain"

Earl of Lemongrab and Finn go on an expedition through the Mountain of Matthew.

The Vampire Diaries (CW) 8 p.m. - "Stay"

Read more in our Highlights section above.

Archer (FX) 10 p.m. - "Sitting"

Archer babysits AJ for a weekend.

Elementary (CBS) 10 p.m. - "The Female of the Species"

An unexpected event brings Watson into contact with Elana March, the convicted crime boss she helped put behind bars. Meanwhile, Holmes teams with Det. Bell to investigate a robbery at a zoo.

Friday, February 13

Constantine (NBC) 8 p.m. - "Waiting for the Man"

Read more in our Highlights section above.

Grimm (NBC) 9 p.m. - "Trial By Fire"

Nick reluctantly asks an old foe for help investigating an arson that appears to have Wesen origins. Meanwhile, Viktor teaches Adalind the effectiveness of well-played diplomacy; and Juliette finds herself in a confrontation sooner than expected.

12 Monkeys (Syfy) 9 p.m. - "The Night Room"

Cole and Dr. Railly battle the Army of the 12 Monkeys after they both discover the Night Room, an off-site, black ops lab that houses the virus that will one day destroy the world.

Helix (Syfy) 10 p.m. - "Oubliette"

Peter reveals is brother's secret and gets them both in trouble; at the same time, Kyle has his hands full trying to quarantine the orchard and the infected hive.

Saturday, February 14

Happy Valentine's Day!

Sunday, February 15

The Walking Dead (AMC) 9 p.m. - "Them"

Life on the road has the group beaten and beleaguered.

(Episode synopses via TV Guide)

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