TV THIS WEEK: The Expanse's final season; new Day of the Dead, The Flash, Hawkeye & more

One of the greatest sci-fi shows of the modern era is kicking off its final adventure this week, as Prime Video's The Expanse comes to a close with its sixth and final season. If that's too space-y for you, no worries, we also have superheroes and zombies to keep you dialed in.

Along with The Expanse's big kickoff, this week also brings a new episode of Disney+'s buzzy Hawkeye series, plus a new Star Trek: Discovery on Paramount Plus. SYFY has new episodes of Day of the Dead and Intergalactic, and the CW has the fourth installment in the five-part "Armageddon" event of The Flash (including plenty of guest stars), as well as Sabrina's arrival on Riverdale.

Apple TV+ has a new episode of its event series Invasion, The CW has a new Riverdale and 4400, Cartoon Network has a new Harry Potter: Hogwarts Tournament of Houses, and CBS has a new Ghosts. SYFY also has a few good genre flicks on tap.

Check out the full rundown below and let us know what you're watching.

HIGHLIGHTS

The Flash (The CW), Tuesday 8 p.m. - "Armageddon, Part 4"

Barry is shocked when Eobard Thawne returns in the most unexpected way; Damien Darhk offers advice to Barry, but there is a catch; an epic battle begins with Reverse Flash pitted against The Flash, Team Flash, Batwoman, Sentinel and Ryan Choi.

Hawkeye (Disney+), Wednesday - "Episode 104"

Set in post-blip New York City. Former Avenger Clint Barton has a seemingly simple mission: get back to his family for Christmas. Possible? Maybe with the help of Kate Bishop, a 22-year-old archer with dreams of becoming a Super Hero. The two are forced to work together when a presence from Barton's past threatens to derail far more than the festive spirit.

Star Trek: Discovery (Paramount Plus), Thursday - "All Is Possible"

Captain Burnham and the crew of the U.S.S. Discovery face a threat unlike any they've ever encountered. With Federation and non-Federation worlds alike feeling the impact, they must confront the unknown and work together to ensure a hopeful future for all.

The Expanse (Prime Video), Friday - Season 6 Premiere

SEASON PREMIERE: Holden and the crew of the Rocinante fight alongside the Combined Fleet of Earth and Mars to protect the Inner Planets from Marco Inaros and his Free Navy's campaign of death and destruction. Meanwhile, on a distant planet beyond the Rings, a new power rises.

Day of the Dead (SYFY), Friday 10 p.m. - "Death Comes to Paymart"

Cornered, the survivors seek any refuge, ultimately taking help from mysterious armed strangers.

MONDAY

4400 (The CW), Monday 9 p.m. - "Empowered Women Empower Women"

Claudette begins to assert her independence; Rev keeps his flock close, further raising Jharrel's suspicions; LaDonna considers her next move; Keisha has a date with Jessica; Andre is concerned by his latest discovery.

Back to the Future (SYFY), Monday 9 p.m.

A teen (Michael J. Fox) takes a crackpot's (Christopher Lloyd) DeLorean time machine to 1955 and sees his parents in high school.

TUESDAY

The Flash (The CW), Tuesday 8 p.m. - "Armageddon, Part 4"

See more in our "Highlights" section above.

Riverdale (The CW), Tuesday 9 p.m. - "Chapter Ninety-Nine: The Witching Hour(s)"

As Bailey's Comet passes over Rivervale, Cheryl and Nana Rose revisit the tragic stories of the Blossom women through the years; the once-in-a-lifetime celestial event prompts Cheryl to summon a familiar face to Rivervale -- Sabrina Spellman.

WEDNESDAY

Hawkeye (Disney+), Wednesday - "Episode 104"

See more in our "Highlights" section above.

Intergalactic (SYFY), Wednesday 10 p.m. - Episode 6

Emma deals with the death of her mother; a Common World soldier boards the spaceship; Common World bullets infect the mutiny with a parasite.

THURSDAY

Star Trek: Discovery (Paramount Plus), Thursday - "All Is Possible"

See more in our "Highlights" section above.

Ghosts (CBS), Thursday 9 p.m. - "Possession"

Hetty accidentally possesses Jay's body just as he and Sam are to about show Woodstone Mansion to a renowned wedding planner.

Legacies (The CW), Thursday 9 p.m. - "You Will Remember Me"

Hope find herself on a dangerous undertaking; Josie goes deep for answers; Lizzie asks Cleo for inspiration and is surprised as to where she finds it; Landon continues his mission for peace.

Wild Wild West (SYFY), Thursday 10:30 p.m.

NETWORK PREMIERE: Secret agent James T. West (Will Smith) and his partner (Kevin Kline) fight evil inventor Dr. Loveless (Kenneth Branagh) who plans to assassinate President Grant.

FRIDAY

The Expanse (Prime Video), Friday - Season 6 Premiere

See more in our "Highlights" section above.

Invasion (Apple TV+), Friday - "Deaths All Over the World"

Follows a global cast - including Sam Neill, Golshifteh Farahani, Shamier Anderson, Billy Barrett, and Shioli Kutsuna - as they try to navigate a terrifying new reality infested by lethal aliens. 

Nancy Drew (The CW), Friday 9 p.m. - "The Voices in the Frost"

Nick, George and Bess unravel the truth behind a college student's mysterious death; unexpected obstacles prevent Ace from working with Nancy and Agent Park as they grow closer and investigate the hidden origin of the Frozen Hearts Killer.

The UnXplained (History), Friday 9 p.m. - "Sacred Bones"

An exploration of the world's most fascinating, strange and inexplicable mysteries. Compelling contributions from scientists, historians, and witnesses as they seek to shed light on how the impossible can happen.

Day of the Dead (SYFY), Friday 10 p.m. - "Death Comes to Paymart"

See more in our "Highlights" section above.

SATURDAY

Peppermint (SYFY), Saturday 8 p.m.

NETWORK PREMIERE: Riley awakens from a coma after surviving a brutal attack that killed her husband and daughter. When the system shields the murderers from justice, Riley transforms herself into an urban guerrilla to deliver her own personal brand of punishment.

SUNDAY

Harry Potter: Hogwarts Tournament of Houses (Cartoon Network), Sunday 8 p.m. - "The Wildcard Round"

Superfans of the "Harry Potter" franchise answer trivia questions about the intricately detailed universe; the winner of the competition earns the title of House Cup Champion.

Legends of the Hidden Temple (The CW), Sunday 8 p.m. - "The Irish Legend of Cuchulainn"

Four teams compete to win the chance at the Temple Run and $25,000.

The Toys That Built America (History), Sunday 9 p.m. - "Toy Car Wars"

A young machinist in England invents one of the world's most successful toys when he creates a toy car small enough to fit inside a matchbox for his daughter to take to school; Elliot Handler creates one of the biggest toy rivalries in history.

*TV listings via Zap2it, network and streaming listings.