Overlord overhears the Underwoods' plan to get rid of him and runs away. Flower tries to gather escaped animals from her Pet Rescue Party and Jim tries to salvage what Overlord has trashed.
Overlord takes on a school bully at Weaver's school but finds he's out of his element. Flower and Jim decide to run a three-legged race for charity, but Flower's competitive side takes over.
Overlord creates a shrinking device that Jim accidentally sets off, shrinking both Weaver and Overlord. Flower accuses Willow of taking her makeup and makes her pay for it by working at the animal shelter.
Overlord brings home an space slug to test Flower's claim that she loves all creatures. Weaver becomes a demanding director when he shoots Willow and Dayna's basketball video.
Overlord crashes the Underwood's annual camping trip. R0-FL gets a nice day off and decides to lets loose in the Underwoods' home.
Overlord zaps the Underwoods to a void outside of time and space so he can watch a movie alone at home. The family must work together to escape or else be trapped forever!
Overlord goes to crazy lengths to buy a blender. Jim and Flower visit a new day spa.
Willow starts dating a boy and Overlord does not approve. Weaver is worried that Bebe has a crush on him and does everything he can to convince her not to fall in love with him.
Weaver receives a DNA test kit for his birthday, only to have Overlord use it on himself. With the threat of Overlord's DNA being discovered, the family works together to keep his existence under wraps.
Overlord finds his place with a group of Live Action Role Players and rises to become their leader. Meanwhile, Flower and Jim won't allow Willow to use the car until she passes their own bizarre tests.
When Willow's girls' soccer team is overlooked, Overlord decides to get involved - for the other team. Flower takes it upon herself to help R0-FL follow her own interests independent of Overlord, but the plans go awry.
After Jim errantly accepts a system update on R0-FL she becomes his assistant and stops at nothing to make sure he accomplishes the task of relaxing. Overlord, meanwhile, hires his nemesis Petey to be his assistant.
The Underwoods look forward to taking their yearly family portrait without Overlord, but their cousin goes to extreme efforts to get in the picture. Willow tries to impress the cool girls.
Overlord is battling homesickness, so the Underwoods agree to celebrate his favourite space holiday. Unbeknownst to them, however, the day always ends with a cruel twist of fate.
Overlord helps Weaver with morning announcements and uses the opportunity to hypnotize the adults at school. Jim drags an unwilling Willow to 'Bring Your Daughter to Work Day'. Flower has trouble letting an adorable hedgehog go.
Jim and Flower throw a dinner party to impress Jim's boss. When the dessert goes missing Overlord becomes the prime suspect. He now must solve the mystery of the missing pie in order to clear his good name.
The Underwoods all have terrible days, so Overlord offers them a shot at re-doing the day with a device he owns. They use it over and over hoping to perfect the day. What they don't realize is they're pawns in Overlord's game.
Weaver is assigned a school project about a person he admires. When he chooses Flower, Overlord becomes jealous and tries to diminish her reputation in her son's eyes. Willow feels left out when River gets along great with Jim.
When Overlord enlists the family to look for an object he misplaced one year ago, he leads the Underwoods to recount the first day he arrived at their home. In the flashbacks, Jim tries to impress his parents at dinner.
Overlord's carelessness puts the family in danger, leading to the ultimate test of his moral compass. Meanwhile, Willow tries to post the perfect verified social media post and Weaver attempts to finally put his stories on film.