TV THIS WEEK: It's an Observer-filled Fringe, Being Human and more!

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Jul 4, 2015, 4:20 PM EDT

After four years, will we finally find out what those Fringe Observer dudes are all about? Let's hope so, especially since Fox's Fringe is taking a month off after Friday's episode. This week we'll also have the return of BBC America's Being Human for a fourth season, which joins Syfy's Being Human on the schedule.

And one of the 63s gets poisonous on Alcatraz, Kenzi eats some toxic soup on Lost Girl, a missing crew member is found alive on The River, Ghost Hunters International returns for a new season and heads to Peru, LeVar Burton guest-judges on Face Off, Reese plays it rich on Person of Interest, it's Dukes of Hazzard time for Archer, Nick and Monroe discover a creature fight club on Grimm, Merlin's magic won't cure an illness outbreak on Merlin, Syfy embraces its inner fairy tale with the back-to-back original films Black Forest and Witchslayer Gretl, and things come to a head between Rick and Shane on The Walking Dead.

Here's what we have to look forward to this week on sci-fi, fantasy, paranormal and spy-fi TV.

Monday, Feb. 20

Alcatraz (Fox) 9 p.m. - "Johnny McKee"

Madsen and the team run up against a dangerous former inmate who likes to poison people. Meanwhile, Madsen learns more about her grandfather.

Here's a preview and a behind-the-scenes sneak peek:

Being Human (Syfy) 9 p.m. - "Mama Said There'd Be Decades Like These"

When Josh discovers that Sally's mother is dying, she wants to reunite with her. Meanwhile, Aidan's memories of the past haunt him.

Here's a promo:

Lost Girl (Syfy) 10 p.m. - "Food For Thought"

Kenzi gets poisoned by some deadly soup from the Fae world, and Bo and Lauren rush to save her.

Here a sneak peek:

Tuesday, Feb. 21

The River (ABC) 9 p.m. - "A Better Man"

The group finds a member of Emmet's crew alive. However, when they discover he's been cursed, Lincoln has a decision to make.

Here's a look at the season ahead:

Wednesday, Feb. 22

Ghost Hunters International (Syfy) 9 p.m. - "Temple of Doom: Peru"

Season premiere! The globetrotting ghost hunters are back, and they're headed to Peru's Chavin ruins to investigate claims of spirit activity, along with a legend about a magic stone.

Here's a promo:

Face Off (Syfy) 10 p.m. - "Alien Interpreters"

LeVar Burton alert! The contestants compete to create extraordinary aliens, and Star Trek: The Next Generation's LeVar Burton guest-judges. However, this time two contestants are sent packing at the end of the challenge.

Here's a preview:

Other Wednesday shows of interest:

On the Science Channel's Prophets of Science Fiction (10 p.m.), it's a look at the voyages of "Jules Verne."

Thursday, Feb. 23

Person of Interest (CBS) 9 p.m. - "Risk"

Reese goes undercover as a wealthy investor at an investment bank.

Here's a promo:

Archer (FX) 10 p.m. - "Bloody Ferlin"

Archer travels into Dukes of Hazzard territory when he tries to help Gillette save his younger brother, who's ended up on the wrong side of a corrupt sheriff in West Virginia.

Here's a preview:

Other Thursday shows of interest:

On CBS's The Big Bang Theory (8 p.m.), Sheldon's life is thrown for a loop when his barber goes into the hospital in "The Werewolf Transformation."

Friday, Feb. 24

Fringe (Fox) 9 p.m. - "The End of All Things"

Observer alert! Yep, we're finally going to find out who or what the Observers are. In the episode, when Olivia is captured by David Robert Jones, Peter and the gang must unlock the mystery of the Observers to save her. Like a lot of shows, Fringe is headed for a mini-hiatus. It's about freaking time! The series returns with new episodes on March 23.

Here's a look:

Grimm (NBC) 9 p.m. - "Last Grimm Standing"

Nick and Monroe end up in the middle of a creature fight club while investigating a double murder.

Merlin (Syfy) 10 p.m. - "Lamia"

When a mysterious illness strikes a village and Merlin's spells are ineffective, the young wizard becomes suspicious that magic is the cause.

Here's a preview:

Other Friday shows of interest:

On CBS's A Gifted Man (9 p.m.), Michael's high-school girlfriend is gravely ill in "In Case of Letting Go." On the Cartoon Network's Star Wars: The Clone Wars (8 p.m.), Count Dooku wants revenge against Ventress and the Nightsisters in "Massacre." On the Travel Channel's Ghost Adventures (9 p.m.), it's a special look back at the past five seasons of "Horror Hotels and Deadliest Hospitals." On Starz' Spartacus: Vengeance (10 p.m.), Spartacus tries to rescue Crixus from the Romans in "Libertus." And on G4's Blade (11 p.m.), there's a new episode called "Claws and Blades."

Saturday, Feb. 25

Being Human (BBC America) 9 p.m. - "Eve of the War"

Season-four premiere! With Mitchell gone, George, Annie and Tom go back to the B&B to take care of the werewolf baby. Unfortunately, drama is just beginning in the baby's life when vampires called the Old Ones arrive.

Here's a look:

Black Forest (Syfy) 9 p.m.

It's a Syfy original fairy-tale double-header, kicking off with Black Forest. In the film, evil baby-stealing creatures go after tourists who've become lost in a magical forest.

Here's a preview:

Witchslayer Gretl (Syfy) 9 p.m.

Second up in this Syfy original fairy-tale double-header, Shannen Doherty is a grown-up Gretl, and we're guessing she's going to be slaying some witches. Stargate Atlantis's Paul McGillion plays an adult Hansel who's out to get vengeance against those he believes killed his sister years before.

Here's a preview:

Saturday, Feb. 26

The Walking Dead (AMC) 9 p.m. - "18 Miles Out"

Rick and Shane butt heads ... again. This time it's about a newcomer. Meanwhile, Hershel's youngest daughter is faced with a difficult decision.

Here's a promo and a sneak peek:

Other Sunday shows of interest:

On Animal Planet's Finding Bigfoot (10 p.m.), it's the "Best Of Special." And on AMC's Comic Book Men (10 p.m.), Walt wants Stash to shoot a "Commercial."

What are you going to watch?