Grodd lives in this week’s episode of The Flash, and the talking gorilla could end up putting Barry’s friends through the wringer. Plus, Person of Interest and Gotham’s seasons come to a close, and the villains of Once Upon a Time get their happy ending — but for how long?

Tonight

Uncle Grandpa (5 PM, Cartoon Network)

Pizza Steve must find a way to sneak onto his own rollercoaster at the newly opened Uncle Grandpa Land.

Gotham (8 PM, Fox)

In the season finale, the gang war is boiling as Fish Mooney goes up against Maroni and the Penguin, while young Bruce searches Wayne Manor for any clues his father may have left behind.

The Originals (8 PM, The CW)

After discovering that he’s been betrayed by his own siblings, Klaus (Joseph Morgan) teams up with an unlikely ally and sets off on a warpath, hell bent on revenge. Amidst the news that Klaus is on the loose, Elijah (Daniel Gillies), Rebekah (guest star Maisie Richardson-Sellers) and Freya (guest star Riley Voelkel) move forward with their plan to lure Dahlia (guest star Claudia Black) to the compound and take her down once and for all. Meanwhile, Hayley (Phoebe Tonkin) and Jackson (guest star Nathan Parsons) attempt to escape through the flooded bayou, even as Marcel (Charles Michael Davis) finds himself hunted by a dangerous new threat. Finally, Davina (Danielle Campbell) is presented with an offer that could allow her the chance to bring back Kol, though it will require her to make a life-altering decision.

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The Returned (10 PM, A&E)

Chloe is endangered; Peter makes a shocking announcement; Helen sets her deadly plan into action.

StarTalk (11 PM, National Geographic)

Neil deGrasse Tyson interviews relationship advice columnist Dan Savage and discusses modern love and dating with guest comedian Chuck Nice and biological anthropologist Helen Fisher.

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Tuesday

Community (Streaming, Yahoo! Screen)

When a clever clever con man, Professor DeSalvo, uses his class to cheat the study group, they enlist Jeff get revenge. The situation goes awry as Britta and Dean Pelton get involved in Jeff and Professor DeSalvo’s scamming competition.

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Uncle Grandpa (5 PM, Cartoon Network)

Uncle Grandpa and the gang go undercover to taste the most sought after treat in the cosmos: the Taco Comet.

The Flash (8 PM, The CW)

Dr. Wells unleashes Gorilla Grodd on the city — and the giant talking gorilla ends up kidnapping Joe.

iZombie (9 PM, The CW)

Liv eats the brains of a straight-talking relationship guru and starts freaking Clive out when she gets personal with him. Plus, Blaine issues a warning — but is it to Liv or to Mason?

Agents of SHIELD (9 PM, ABC)

Skye is torn between SHIELD and the Inhumans — and Coulson reveals a secret he has been keeping even from those closest to him.

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Forever (10 PM, ABC)

Jo and Henry end up investigating a string of murders related to an ancient dagger — the one that killed Julius Caesar and killed Adam for the first time. But while Henry and Adam head toward a major conflict, Adam knows that Henry’s greatest fear is that Jo might learn his secret.

Person of Interest (10 PM, CBS)

When the Samaritan locates the Machine, Finch and Root must race to save it. Meanwhile, Reese is caught between crime bosses Elias and Dominic in their final conflict.

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Wednesday

Uncle Grandpa (5 PM, Cartoon Network)

Uncle Grandpa’s number one fan gets more than he bargained for when Uncle Grandpa overstays his welcome.

Arrow (8 PM, The CW)

Oliver must complete two final tasks in order to become the next Ra’s al Ghul. Meanwhile, Malcolm has a surprising offer for Team Arrow, and Thea reunites with Roy.

Supernatural (9 PM, The CW)

The Winchesters go head-to-head with the Styne family, and Castiel must play referee when Charlie and Rowena team up to work on the Book of the Damned.

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CSI: Cyber (10 PM, CBS)

Special Agent Avery Ryan and her team investigate when a man dies after taking medication he purchased from a hacked ad on a medical website.

Thursday

Cartoons (5 PM, Cartoon Network)

On Uncle Grandpa (5 PM), the gang gets nutty after repeatedly failing to open a mysterious package. On Clarence (5:30 PM), it’s time for the annual Aberdale Greased Pig Chase, but Clarence feels bad for the big and takes her place. On Teen Titans Go! (6 PM), Beast Boy takes up gardening so his head will stop shrinking. And on Adventure Time (7:30 PM), Cuber is marooned on an alien world and must rely on his bag of Graybles to survive.

The Vampire Diaries (8 PM, The CW)

It’s Alaric and Jo’s wedding day, and while Elena and Bonnie try to help Jo keep her cool, Stefan takes Damon on a road trip to give him some perspective on his future with Elena. And Caroline makes amends with her friends after her humanity-off rampage and realizes something about her own relationship with Stefan.

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Olympus (10 PM, Syfy)

Hero turns to an unlikely source for help with his destiny, while Oracle, Lykos and Madea’s schemes have lethal consequences for a familiar face.

Friday

Major Lazer (12 AM, FXX) & Axe Cop (12:15 AM, FXX)

The Jamaican dystopian superhero and the axe-wielding cop are back for another late night of mayhem.

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Grimm (8 PM, NBC)

Hank and Nick close in on a serial killer while Wu finds his life in danger and Juliette forges a new alliance on her path to revenge.

Bitten (9 PM, Syfy)

While Elena, Logan and Rachel target an escape route, Aleister’s true agenda is at last revealed.

The Messengers (9 PM, The CW)

The Horseman of War will be speaking at an international energy summit and it is up to our heroes to figure out which attendee is the victim and which is the Horseman before someone dies. Meanwhile, one of the Messengers is in jail and The Man (Diogo Morgado) is determined to keep him there.

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Lost Girl (10 PM, Syfy)

Bo and Tamsin disagree over a young Fae who needs help, and whose real story is a game changer.

Saturday

Orphan Black (9 PM, BBC America)

Sarah’s fate hangs in the balance as she tries to save her sister.

Outlander (9 PM, Starz)

Claire and Jenny set out to rescue Jamie from his redcoat captors; unorthodox tactics are used.

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Sunday

Once Upon a Time (8 PM, ABC)

In the two-part season finale, we see what happens when our villains get their “happily ever afters” and the heroes aren’t so heroic anymore.

Game of Thrones (9 PM, HBO)

Dany makes a difficult decision regarding Meereen. But things are especially interesting in Winterfell, where Brienne is still tracking Sansa Stark and Theon remains under Ramsay’s control.

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Lizzie Borden Chronicles (10 PM, Lifetime)

Lizzie devises a strategy that stops Siringo cold, and unleashes a more blunt and sinister side then ever before. Meanwhile, Emma begins to lose trust in Lizzie; and a co-conspirator who fails Lizzie realizes his mistake too late.

Penny Dreadful (10 PM, Showtime)

Ferdinand Lyle reveals the disturbing backstory of the Verbis Diablo.

Salem (10 PM, WGN)

Countess Marburg arrives in Salem and threatens Mary’s stronghold on the city.

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