The Thundercats are exhausted from fighting bad guys all the time so Lion-O suggests they spend a relaxing summer fun day at the beach, with no fighting. Unfortunately the beach is home to the Crabmen, giant, clawed humanoids that fight anyone who steps on their sand. Looks like summer fun day might involve some fighting.
While minding her own business, Cheetara is caught in a trap set by Safari Joe, the famously annoying hunter. After escaping, she rallies the other ThunderCats to help her stop Joe once and for all, by turning the tables and capturing him.
Dr. Oakley travels to a remote village to treat the local dogs and investigates what’s ailing reindeer at the Alaska Wildlife Conservation Center.
When a mysterious carnival barker fuses Vic and Val together, they must find a way to come unstuck.
Victor and Valentino enter Achi in a dog show competition to win a golden trophy, but their overbearing ways drive Achi to the edge.
Young Dal lets Hyo Sin and Joon Seon's secret roommates stay in the rooftop house. Young Dal's birthday celebrations begin with a big breakfast with the new additions to his family. Later on, Ok Boon has a great time taking Na Hee and Gyu Jin around to brag to the market ladies. After the party, Joon Seon confronts Na Hee about her divorce.
With her friends by her side and her ruby slippers on her feet, Dorothy follows the Yellow Brick Road toward magical mischief and embarks on exciting adventures that only a land like Oz can bring.
When Zobo gets depressed because he has no friends like him, Olivia decides to create him a company.
As Young Dal's birthday approaches, Ok Boon wants to throw a birthday party. Although Young Dal never agreed to celebrate his birthday before, he decides to let Ok Boon enjoy showing off Na Hee and Gyu Jin to the market ladies at the party. Meanwhile, Joon Seon is furious about Na Hee keeping her divorce a secret.
The group centers on generational trauma and how we can break the cycle for our children. The couples take a DNA-compatibility test with surprising results. Spirit locates the father Breyon never met and finds three siblings he didn't know he had.
An engineer named Rusty leads a team of rescue robots. Together, they invent their way out of difficult situations.
The kids find a sparkle memory of the bookstore’s opening day, revealing more secrets that Ruben’s grandma kept from his grandpa.
Wondering if Grandma’s “unfinished business” involves an old friend, Ruben and Raine track down Sofia to see if she's ”S”.
Just as the kids are hitting a dead end in the mystery, Ghostwriter takes things to the next level by releasing characters from Frankenstein.
When the kids partner with Raine to dig into Grandma's memories, they make a surprising discovery.
Things don't go as expected when the kids attempt to build a new creature to appease Frankenstein's monster.
It's up to the kids to save the day when it turns out the new monster is not only heartless, but visible to everyone.