Julia, a 14-year old orphan, is placed in the care of foster parent Mr. Leopold where she joins his other charges, Johnny, Tabby and Finn, on a 2000 -acre farm. But when an Alien's ship crashes into their barn they learn Julia is not the only new arrival.
The escaped endlings on the Leopold farm put the family at odds, leaving Julia's future there in question. But after one of the creatures allows Julia to relive her past, it's up to her to decide whether or not she'll let her past control her future.
Another endling's escape wakes the injured Alien. With the police and a mysterious guest on their way, Tabby and Julia argue over what to do with their now awake visitor, while Johnny worries about another run in with law enforcement.
With Julia and Finn on the run with the Alien, it's up to Johnny, Mr. Leopold and a reluctant Tabby to find them. What they don't know is that while Julia is trying to get away from the farm, a subterranean creature IS being lured there.
After Tuko's caretaker Abiona takes revenge on the Alien; Julia must find a way to convince her to help. Unfortunately, the Alien isn't the only being who needs saving as Johnny, Tabby and Finn deal with a new endling, this one from earth's own history.
The pursuit of a mysterious new creature catches the attention of the local police. After a particularly close encounter, Mr. Leopold forbids Johnny from continuing the chase, causing a rift between foster father and son.
Tabby has a disappointing visit with her estranged mother while Julia, Johnny and Finn try to save an adorable endling. When Tabby falls in love with the new creature and tries to hide It, her feelings threaten the safety of her foster family.
Abiona pins Johnny and Julia's search for a new sightless endling, while back at the farm Tabby tries to keep Finn and Mr. Leopold from discovering the creature she's hiding in the house.
While Mr. Leopold confronts his past, Johnny, Julia, Tabby, and Finn must trap a recently released endling before it traps them.
With the recently named Alien on the mend Julia, Johnny, Tabby and Finn turn their attention to helping a new endling that can't survive in the cold. But the creature's unique ability to hide makes saving it nearly Impossible.
While pursuing an elusive endling, Julia, Johnny, Tabby and Finn come across a menacing trap and realize they're not the only ones trying to capture the creature.
Tabby, Johnny, Julia and Finn race to save a trapped endling while a seemingly endless stream of drones try to capture It. Unhappy with her drones' progress, Hewes and her team arrive to finish the mission themselves.
The fight to save endlings continues as Julia, Johnny, Tabby and Finn track Hewes to her Infinitum facility. When Hewes cracks open an orb releasing a dangerous creature, our heroes have no choice but to bring the fight to her.
Hewes uses Johnny and Julia’s pasts against them as Ling unwittingly gives Tabby a startling vision of what’s to come, forcing the family to decide whether to fight the future or accept it as fate.
While Johnny, Tabby and Finn wrestle with their potential futures, Julia can’t leave her past behind. But when an old threat becomes new again, the group realizes that the actions they take today will determine their tomorrows.
When Julia is forced to face a familiar enemy alone, all of the endlings are caught in the balance. To save their mission and her new family, Julia must finally face her greatest hurt.
Finn accidentally releases an electrifying new endling as Tabby struggles with an impending reunion. Meanwhile a sighting of a recently extinct animal leads Mitra and Lopez back to Hewes.
When a playful endling takes control of the farmhouse, locking Julia, Johnny and Finn inside, it's up to Tabby to save them. But figuring out how to stop this temperamental being, means learning how to win its game.
As the search for the polar bear intensifies, our heroes accept a new foster endling into their family. Meanwhile, Tabby reconnects with her old life in a way Finn wishes he could.
As Finn searches for home, Johnny, Julia and Tabby try to save an endling who no longer has one. But when Hewes visits someone from Johnny’s past, she puts their entire mission at risk.
The future crashes into the present as Julia, Johnny, Tabby, and Finn deal with the aftermath of Hewes’s attack. In the fallout, our heroes will have to choose whether to come together or let their pain tear them apart.
To prevent the future Tabby saw in her vision the family only has two choices to deal with Hewes: run away or stay and fight. For Johnny that means moving past his own pain to see that Hewes has vulnerabilities of her own.
The future the family has been trying to prevent has finally arrived as Hewes’ team descends on the farm. As Johnny loses hope, it’s up to Finn, Tabby, and Julia to defend their home.
When Hewes’ plan succeeds, Julia, Johnny, Tabby, and Finn must let their hopes, not their hurts, shape their future in order to save Ling and their mission.