The curtain is pulled back on the millennia-old battle between the organizations of good luck and bad luck that secretly affects everyday lives.
Plagued by bad luck all her life, 18-year-old Sam, a bright-eyed orphan brought up in the care system, is about to enter the real world and move into her new house. And as she bids farewell to her best friend and roommate Hazel, Sam is officially on her own. But it's a jungle out there, especially when you are the unluckiest person in the world. However, as Sam tries to find her feet, preoccupied with doing the right thing, change arrives in the shape of a mysterious black cat and a shiny lucky penny. Now, the sky's the limit. But first things first. Where does luck come from? If Bad Luck is a mirror image of Good Luck, is Sam about to embark on the adventure of a lifetime?—Nick Riganas
A down-on-her-luck orphan has a chance encounter with a mysterious cat whose power takes the form of a coin: a coin of Luck. After this chance encounter, this woman and the cat will forever change the realm of Luck itself. But will their good fortunes run out?—Johnny-the-Film-Sentinel-2187
Sam Greenfield, an orphaned young woman with a life plagued by misfortune, is forced out from her foster home, much to the dismay of her younger friend and roommate Hazel, who is hoping to be adopted soon. One night, after sharing food with a black cat, Sam finds a penny she hopes to give to Hazel for her collection of lucky items that may help her get adopted. The next day, Sam notices that the penny has made her luck improve. However, she loses the penny by inadvertently flushing it down a toilet.
While bemoaning her error, Sam encounters the cat again and says what happened, which causes the cat to berate her for losing the penny. Shocked that the cat could talk, Sam follows the cat through a portal to the Land of Luck, where creatures like leprechauns create good luck for the people on Earth. The cat, named Bob, needs the penny for traveling purposes and will be banished if word gets out that he lost it. Bob and Sam make a deal to get another penny from the Penny depot for Hazel to use before returning it to Bob. Bob uses a button from Sam to pass off as a penny while she sneaks into the Land of Luck using clothes belonging to Bob's personal leprechaun, Gerry. Throughout the journey, Sam comes to learn that bad luck is managed underneath the Land of Luck.
Following a disaster at the Penny depot which causes Gerry to learn about Sam's identity, Gerry uses a drone to retrieve the missing penny on Earth. However, the drone gets lost in the In-Between, a space between the Good and Bad Luck lands. Sam and Bob go to the In-Between, which is managed by a unicorn named Jeff. Jeff manages the Bad Luck Apparat, a machine that keeps bad luck specks from sticking which feeds the Randomizer, another machine that sends both good and bad luck into Earth. Jeff reveals that he found the penny and has returned it to the depot. Undeterred, Sam decides to visit Babe, the dragon who manages the good luck, in hopes to get another penny. Babe tells Sam how better things would be if everyone had good luck before giving her a new penny. But Sam sacrifices her penny after Bob is caught for faking his travel penny to spare him from banishment.
Still wanting to help Hazel, Sam and Bob decide to temporarily shut down the Bad Luck Apparat to prevent bad luck from going to the Randomizer and give Hazel the luck she needs to get adopted. However, the bad luck specks start to clog Jeff's machines and destroy the good luck and bad luck stones within the Randomizer, which itself brings bad luck to the Land of Luck and Earth. Seeing Hazel did not get adopted because of this, learning that Bob is actually an unlucky English cat and having been found out as a human, Sam sulks in remorse. Bob apologizes and says that Hazel is the luckiest girl for having Sam at her side. Sam realizes things can be fixed because she remembers seeing some good luck in Bad Luck land while on her way to the In-Between.
In Bad Luck, they find it in a wiki bar where the bartender, a root monster named Rootie, who is Bob's old friend, gives them a jar of good luck they have been using. They take it to Babe to forge new good and bad luck stones. However, while creating a bad luck stone, Babe makes two good luck stones, wanting to create a world with only good luck. Before she can place them, Sam tells Babe people need bad luck as much as good luck. Realizing her mistake, she allows Sam to place the bad luck stone, and good luck is restored to normal, where Sam sees Hazel getting adopted by a new family. Bob is offered to keep his job at the Land of Luck, but decides he wants to live with Sam.
One year later, on Earth, Hazel's family spends time with Sam and Bob, who have accepted their bad luck.
