TV THIS WEEK: Project Blue Book and Legends return, Arrow’s backdoor pilot, and more

The Crisis on Infinite Earths might be over, but there's still plenty of Arrowverse action on TV this week. Your favorite UFO hunters are also back in action, plus a whole lot more.

The big stories this week are season premieres for The CW's weird and wild team-up Legends of Tomorrow, as well as History's excellent alien-investigating Project Blue Book. Digging a bit deeper, Arrow is back with its penultimate episode, which jumps the action to 2040 and serves as a backdoor pilot for that Green Arrow & the Canaries spinoff. Elsewhere, Black Lightning, Supergirl and Batwoman are all still dealing with the weird fallout of a post-Crisis world.

Beyond that, NBC's The Good Place continues to march toward its conclusion with the penultimate episode before next week's two-part series finale. NBC has a new Manifest, SYFY has a new episode of The Magicians, HBO has the network premiere of recent horror flick The Curse of La Llorona, along with a new The Outsider.

Check out our full rundown below and let us know what you'll be watching.

HIGHLIGHTS

Project Blue Book (History), Tuesday 10PM - "The Roswell Incident - Part 1"

SEASON PREMIERE: Hynek and Quinn follow General Harding to Roswell, New Mexico, where someone has threatened to expose evidence to the world of an extraterrestrial crash-landing six years ago.

Arrow (The CW), Tuesday 8PM - "Green Arrow & the Canaries"

It's the year 2040 in Star City and Mia Queen has everything she could have ever wanted. However, when Laurel and Dinah suddenly show up in her life again, things take a shocking turn and her perfect world is upended. Laurel and Dinah are tracking a kidnapping victim with direct ties to Mia and they need her help. Knowing it will change everything, Mia can't help but be a hero and she, Laurel and Dinah suit up once again to save the city.

DC's Legends of Tomorrow (The CW), Tuesday 9PM - "Meet the Legends"

SEASON PREMIERE: In the Season 5 premiere, Sara, Ray and Mick are shocked that the Legends have become famous. It seems that everyone except Sara is loving the spotlight, so much so that they invite a documentary crew on board the Waverider to film them as they investigate a strange new blip in the Timeline. The Legends discover that their new problem is none other than Rasputin, who happens to be straight out of hell, and it might be tougher than they thought.

The Magicians (SYFY), Wednesday 10PM - "The Wrath of the Time Bees"

Alice does not buy enough tacos.

The Outsider (HBO), Sunday 9PM - "Que Viene El Coco"

While retracing the Maitlands' recent family vacation, Holly pursues a possible connection to an eerily similar case and gains valuable insight from local former detective Andy Katcavage; Glory faces increased scrutiny in her daily life.

MONDAY

Black Lightning (The CW), Monday 9PM - "The Book of Markovia: Chapter One: Blessings and Curses Reborn"

Jefferson navigates his new reality following the events of the Red Wave, and Lynn's determination to save the meta kids deepens her troubles. Meanwhile, Anissa/Blackbird faces new challenges. Lastly, Jennifer's bond with Brandon begins to grow.

Manifest (NBC), Monday 10PM - "False Horizon"

The Stone Family struggles to unlock their mysterious wave of frightening 828 callings, while the person who may be key to solving them is trapped behind bars. Meanwhile, a shocking and disturbing incident leads Grace to suspect a local mom is in danger. Guest starring Susan Pourfar, Erika Chase and Ed Herbstman.

TUESDAY

Arrow (The CW), Tuesday 8PM - "Green Arrow & the Canaries"

See more in our "Highlights" section above.

DC's Legends of Tomorrow (The CW), Tuesday 9PM - "Meet the Legends"

See more in our "Highlights" section above.

Emergence (ABC), Tuesday 10PM - "Killshot Pt. 1"

Jo makes a high-stakes deal to take down Helen and keep Piper safe. Meanwhile, Helen attempts to replicate Piper's powers for herself, and Benny struggles to earn back Jo's trust before it's too late.

Project Blue Book (History), Tuesday 10PM - "The Roswell Incident - Part 1"

See more in our "Highlights" section above.

WEDNESDAY

Riverdale (The CW), Wednesday 8PM - "Chapter Sixty-Seven: Varsity Blues"

Riverdale High prepares for the championship football game against Stonewall Prep; and Betty gets to work on a story about the rivalry between the schools. Archie is conflicted when Mary tells him about Uncle Frank's troubled past. Cheryl goes head to head with Ms. Appleyard, the school's new cheerleading coach, and Veronica hits a road block with her latest Luna Rum recipe. Finally, Jughead is forced to pick a side after the perks of attending Stonewall Prep interfere with his personal life.

Nancy Drew (The CW), Wednesday 9PM - "The Phantom of Bonny Scot"

Nancy's quest to clear Carson's name clashes with Owen's pursuit of justice for the victims of the Bonny Scot. As a result, she has to decide just how far she's willing to go to get her dad out of jail.

The Magicians (SYFY), Wednesday 10PM - "The Wrath of the Time Bees"

See more in our "Highlights" section above.

Vikings (History), Wednesday 10PM - "Valhalla Can Wait"

Bjorn faces a hard decision. Torvi and Ubbe leave Kattegat in search of new lands.

THURSDAY

Supernatural (The CW), Thursday 8PM - "The Heroes' Journey"

Sam and Dean hit the road to help an old friend, but it appears that their luck may have finally run out and they are the ones who may be in need of rescue.

The Good Place (NBC), Thursday 8:30PM - "Patty"

The penultimate episode of the final season of The Good Place.

Legacies (The CW), Thursday 9PM - "This Is Why We Don't Entrust Plans to Muppet Babies"

The witches of the Salvatore School come together to celebrate Coven Day. The latest monster to infiltrate the school targets Alyssa Chang and the other students by spreading discord and creating chaos among the covens. Elsewhere, Alaric, Lizzie and Josie search for a solution that keeps Josie protected from the dark magic brewing inside the mora miserium. Fed up with feeling powerless, Landon asks Hope to give him self-defense training. Finally, Alaric's past comes back to haunt him.

FRIDAY

Charmed (The CW), Friday 8PM - "Curse Words"

Maggie and Mel fear Jordan's curse is alive and well. Macy and Harry confront unspoken feelings.

SATURDAY

The Curse of La Llorona (HBO), Saturday 8PM

PREMIERE: Ignoring the eerie warning of a troubled mother, a social worker and her own children are drawn into a frightening supernatural realm. Their only hope of surviving the legendary ghost La Llorona is a disillusioned priest who practices mysticism.

UFOs: Top Secret Evidence Revealed (History), Saturday 8PM

UFO experts have long suspected the government of covering up its involvement in extraterrestrial phenomena; a top secret manual may be the smoking gun that finally links the government to the UFO mystery.

What on Earth? (Science), Saturday 8PM

An exploration of breathtaking images and unfathomable mysteries.

Seven Worlds, One Planet (BBC America), Saturday 9PM - "North America"

In winter, lynx prowl the Yukon for snowshoe hares and manatees seek hot springs to escape the freeze; in summer, Tennessee fish build spectacular underwater pyramids, fireflies light up the forest's nights, and polar bears leap from rocks.

Paranormal 911 (Travel), Saturday 9PM - "Uninvited House Guest; Perimeter Breach; Asylum Attack"

A police officer encounters a terrifying entity while investigating a home invasion; a tortured apparition wreaks havoc on a top-secret government site; paramedics are brutally attacked by an unseen force at an asylum.

SUNDAY

Batwoman (The CW), Sunday 8PM - "An Un-Birthday Present"

On the Kane sisters' birthday, Kate and Alice contend with demons from the past; an unexpected guest makes a surprise appearance in Gotham.

Doctor Who (BBC America), Sunday 8PM - "Fugitive of the Judoon"

A Time Lord travels through the universe and time.

American Ninja Warrior (NBC), Sunday 9PM - "USA vs. The World"

Men and women from all walks of life and every corner of the country come together to pursue their common dream of reaching Mount Midoriyama, the world's most notorious obstacle course.

Supergirl (The CW), Sunday 9PM - "Back From the Future - Part One"

Supergirl tries to thwart a Toyman copycat; Winn Schott returns from the future.

The Outsider (HBO), Sunday 9PM - "Que Viene El Coco"

See more in our "Highlights" section above.

*TV listing information via TV Guide, Zap2it.