They've fought through space, time and alternate realities to find each other, and now, closer than ever, only their own demons can stop FitzSimmons' reunion.

BattleBots Champion Bite Force squares off against famed bot Yeti, while another legendary builder returns to the competition with a brand-new epic bot.

Did aliens from the tiny star Sirius B visit humans in the distant past, imparting the knowledge of civilization to peoples thousands of miles apart? And did they leave behind a vital clue in the form of a word that's embedded in languages all over the globe?

Jett is forced to mastermind a heist at the site of a high-end poker game. Baudelaire's son Junior continues to vex his father.

TOP-OF-SHOW: Allan Lichtman
THE PANEL: Thom Hartmann, Liz Mair & Dan Savage
MID-SHOW INTERVIEW: Dr. Debra Soh.

A mysterious woman enlists Los Espookys to frighten five people vying to win a millionaire's fortune by staying through the night at his "haunted" mansion. Tasked with ensuring the man's son doesn't win the loot, Renaldo agrees to attempt a challenging stunt to crown a winner. Meanwhile, in LA, Tico finds himself in the art-world spotlight after a case of mistaken identity.

Stephen welcomes actress Naomi Watts with musical guest The Raconteurs.

When Sallinger posts a video teasing his next crime, Jessica responds with her own media play. Jeri demands that Malcolm identify the masked woman.

Six months after the disappearances, the police form a task force. In 2052, Jonas learns that most of Winden perished in an apocalyptic event.

While Swamp Thing senses a growing darkness within the swamp, Abby's return dredges up her dark history with the Sunderlands. We learn more about the mysterious Dan Cassidy.

On the last day of class before summer break, Gabe learns several of his students are being transferred out of Woodrow Wilson High School.

With the afternoon off from school, Elodie reconnects with her crush, Tabitha goes shopping with a friend, and Moe spends time with Noah.

Martin prepares to join Viggo, as Jesus's revenge plans are revealed.

Now with a driver's license, Retsuko takes Gori and Washimi on a road trip, but things go south when the two ladies get into a heated argument.

The chase is on and Kayo and Alan work quickly to re-capture Thunderbird 3 from Havoc. Meanwhile, Scott's efforts to extract the escape pod run into additional complications.

Luna and Celestia take a sister vacation while Twilight and her friends struggle to cover the princesses' many royal duties.

Duffy makes the tough decision to hang up her uniform. Jacob discovers a truth from his past. Connie is furious with Ciaran when she finds out that Duffy has stepped down.

In the wake of the previous season's victory, the ninja have gone soft and Master Wu must remind them of who they truly are.

Realizing they have gone soft, the ninja search for a quest to reignite their Spinjitzu training; unfortunately, Ninjago City is enjoying a period of rare tranquility.

Note: This is the 100th episode of the series overall.