TV THIS WEEK: Freeform’s Siren premieres, Supernatural meets Scooby Doo, new Krypton and more

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Mar 26, 2018, 6:45 PM EDT

There's a little bit of everything this week. From dark mermaids to Scooby-Doo crossovers with CW staples, prepare to start checking some stuff off your bucket list.

Freeform's new series Siren makes its debut this week, while Supernatural crosses over with Scooby-Doo for what promises to be one heck of a meta episode (loaded with Dean hitting on Daphne, we'll assume). It's not exactly genre, but FX's acclaimed thriller The Americans is also back this week. SYFY has a new episode of the Superman prequel Krypton, as well as some political fantasy intrigue on The Magicians.

Rounding out the week, there are also new installments of The Walking Dead, iZombie, Black Lightning, Last Man on Earth, and a whole lot more. Check out our full rundown below and let us know what you'll be watching.


Krypton (SYFY), Wednesday 10 p.m. - “House of El”

After suffering a tragedy, Seg is forced to adjust to a new life, a new rank, and a new threat.


Siren (Freeform), Thursday 8 p.m. - “Pilot,” “The Lure”

SERIES PREMIERE: In the series premiere, a mysterious girl arrives in a small coastal town, leading to the return of vicious mermaids who are seeking to reclaim their rule over the ocean. Then: On the North Star, Ben discovers a strange device in the water that could lead to Chris.


Supernatural (The CW), Thursday 8 p.m. - “Scoobynatural”

Sam, Dean, and Castiel are transported into the animated world of Scooby-Doo, where they join forces with the Scooby gang to solve a ghostly mystery.


The Walking Dead (AMC), Sunday 9 p.m. - "Still Gotta Mean Something"

A Heaps prisoner makes a discovery; Carol searches for someone in the nearby forest; Rick and Morgan find themselves in the company of strangers.


The Last Man on Earth (Fox), Sunday 9:30 p.m. - "Release the Hounds"

Todd sinks into a deep depression, leaving the rest of the gang to console him. Meanwhile, Tandy and Carol can't keep their hands off each other.


DC's Legends of Tomorrow (The CW), Monday 8 p.m. - “I, Ava”

When Ava disappears, Sara and Ray set out to find her after some prodding from Time Bureau agent Gary and a disturbing truth about Ava. Amaya tasks Zari with helping train Rory in controlling his own Totem power. Meanwhile, Nate and Wally set out on a mission that goes awry when they pair with an unlikely person to try and get a Totem.


Lucifer (The CW), Monday 8 p.m. - “Orange is the New Maze”

When Maze is the prime suspect in a murder, Lucifer and Chloe enter the world of bounty hunting to investigate. Maze decides she wants to go back to Hell, but after Lucifer refuses, she turns to Pierce for help.


The Terror (AMC), Monday 9 p.m. - “Go for Broke; Gore”

An accident at sea cripples a Royal Navy expedition 200 miles from finding the Northwest Passage, forcing its captains to make a dire choice. Series premiere.


iZombie (The CW), Monday 9 p.m. - “Goon Struck”

While tracking the murder of a hockey player, Liv stumbles onto Chase Graves' evil plan. Meanwhile, Major is forced to make a horrible decision. Lastly, Peyton tries to contain a volatile situation.


Scorpion (CBS), Monday 10 p.m. - “Foul Balls”

Team Scorpion must use their high IQs to win a softball game when the homeland director challenges, with all of their future government contracts on the line. Also, Walter's secret night out with Florence puts Toby and Happy on edge.


Final Space (TBS), Monday 10:30 p.m. - “Chapter Five”

Gary, Quinn, and Avocato trace the gravitational disturbance to an eerie bioluminescent planet.


Shadowhunters (Freeform), Tuesday 8 p.m. - “The Powers That Be”

The Warlocks' magic is corrupted by a demonic presence while Izzy and Luke try to track down more information on the recent series of possessions.


Black Lightning (The CW), Tuesday 9 p.m. - “Sins of the Father: The Book of Redemption”

Black Lightning attempts to rescue several long-missing children reveal a secret he did not anticipate, and its resulting connections. Gambi struggles to stay strong while in a compromising position. Jefferson begins to view things differently.


Riverdale (The CW), Wednesday 8 p.m. - “Chapter Thirty: The Noose Tightens”

Just as the town's mayoral race gets underway, Riverdale High's own student council election heats up. Archie steps up to help after learning that Hiram's mobster associates have come to Riverdale to stir up some trouble. Meanwhile, things take a dangerous turn for Alice, Betty, and Chic when an unexpected guest shows up at the Cooper residence. Finally, Toni, Veronica, and Josie team up to solve a strange mystery involving Cheryl.


The Magicians (SYFY), Wednesday 9 p.m. - “The Fillorian Candidate”

The political situation in Fillory comes to a head. Julia makes amends and Alice makes a confession.


Krypton (SYFY), Wednesday 10 p.m. - “House of El”

See more in our “Highlights” section above.

The Americans (FX), Wednesday 10 p.m. - “Dead Hand”

SEASON PREMIERE: Season 6 opener: In the autumn of 1987, a major arms-control summit looms, and Elizabeth is pushed to her limits as never before; and Philip has settled into running their expanded travel agency, until an unexpected visitor makes a disquieting request.


Gotham (Fox), Thursday 8 p.m. - “A Dark Knight: One of My Three Soups”

Arkham's "finest" give Gordon and Bullock a run for their money as they hatch a plan to escape the asylum. Meanwhile, Bruce devises his own strategy to thwart their plans. Also, Barbara gets an offer she can't refuse.


Siren (Freeform), Thursday 8 p.m. - “Pilot,” “The Lure”

See more in our “Highlights” section above.

Supernatural (The CW), Thursday 8 p.m. - “Scoobynatural”

See more in our “Highlights” section above.

The Big Bang Theory (CBS), Thursday 8 p.m. - “The Gates Excitation”

Penny gets the opportunity to host Bill Gates at work when his company wants to partner with her pharmaceutical company. Also, Leonard, Koothrappali, and Wolowitz do everything in their power to meet him, while Sheldon thinks he is the victim of an April Fools prank.


Arrow (The CW), Thursday 9 p.m. - “The Thanatos Guild”

Nyssa Al Ghul returns to Star City to warn Thea that a group of renegade League of Assassins members are planning to attack her. This group, led by Athena, is intent on finding a mysterious box that Malcolm left behind and will stop at nothing to get it. Nyssa helps Oliver come to a life-changing realization.


Blindspot (NBC), Friday 8 p.m. - “Mum's the Word”

The FBI team and Avery attend a gala hosted by their target Hank Crawford in hopes of arresting him. Roman grows closer to the Crawfords.


MacGyver (CBS), Friday 8 p.m. - “Riley + Airplane”

When Matty and the team search for a former government tech who stole classified intel and has been evading capture, they reunite with the Coltons, the family of bounty hunters, who are pursuing the same man for different reasons.

Once Upon a Time (ABC), Sunday 8 p.m. - “Sisterhood”

The latest episode of the fairy tale drama.


Josh Gates' Destination Truth (Travel), Friday 9 p.m. - “Bigfoot in Malaysia and the Argentinian Lake Monster”

Josh journeys to Malaysia to investigate recent reports of Sasquatch sightings in the rainforest. Then he cruises across Argentina, on the hunt for a massive creature said to be similar to the Loch Ness monster.

Marvel's Agents of S.H.I.E.L.D. (ABC), Friday 9 p.m. - “Rise and Shine”

Coulson uncovers General Hale's true agenda, and it could be the end of the world if S.H.I.E.L.D. doesn't help her.


Ghost Adventures (Travel), Saturday 9 p.m. - "The Alley of Darkness"

Zak and the crew investigate an iconic Los Angeles recording studio plagued with a dark presence that may be tied to its past.


Counterpart (Starz), Sunday 8 p.m. - "No Man's Land, Part Two"

The latest episode of Starz's mind-bending thriller.


Ash vs. Evil Dead (Starz), Sunday 9 p.m. - "Tales From the Rift"

Ash's wild adventure continues as he takes on all sorts of undead baddies.


The Walking Dead (AMC), Sunday 9 p.m. - "Still Gotta Mean Something"

See more in our "Highlights" section above.

The Last Man on Earth (Fox), Sunday 9:30 p.m. - "Release the Hounds"

See more in our "Highlights" section above.