

Learning they are not well-liked, Korvo and Terry use the nanobots' information to win over the community and run for president of their homeowner association. Korvo and Terry place nanobots in the city's water supply to spy on their neighbors. As the Shlorpian family has dinner together, it is revealed that the Pupa, will one day evolve and destroy Earth to terraform a new Shlorp. They shrink Funbucket and prepare to kill him, but Travis and Avery take him instead. Korvo and Terry create another mutated Funbucket who accidentally fuses with the first, becoming a monster that terrorizes the city. When she threatens to go to the authorities, they attempt to lobotomize her, and Terry pours soda on her exposed brain, erasing her memory. They shrink a bully named Lydia, hoping to use her to study human behavior. Forced to attend high school, Yumyulack and Jesse are menaced by their classmates and faculty. Realizing that the titular alien is fictional, they create a real Funbucket, who tires of them and befriends humans Travis and Avery. Korvo is determined to repair their spaceship, but Terry introduces him to the television show Funbucket.

One year after escaping the destruction of their planet Shlorp and crashing on Earth, adult aliens Korvo and Terry, their two "replicants" Yumyulack and Jesse, and their "pet" The Pupa adjust to their new lives.

Miguel Sandoval as Enrique: the father of Pedro.She was so named by Cherie because she was born inside a PEZ dispenser. Pezlie: the daughter of Cherie and Tim.Rainn Wilson as Steven: the former CEO of AT&T who becomes a mouse milk farmer with his pet mouse, Molly, in the lower levels.Brown as Halk Hogam (season 2): A haunted war hero of the Resistance and former Bones executive producer trying to solve a string of grisly murders in peacetime. Alfred Molina as The Duke / Ringo (seasons 1–2): the corrupt ruler of Yumyulack's Wall, he maintains order and control by hoarding the supplies given to the Wall's inhabitants by Jesse.She becomes one of Tim's companions in his fight against the Duke. Christina Hendricks as Cherie: A Benihana chef placed in the Wall by Yumyulack for serving him shrimp he didn't want.He becomes a scavenger and resistance leader against the Duke's regime, before taking his place. Andy Daly as Lindsey Tim: One of Yumyulack's captives, shrunk down for wearing a red shirt.Sagan McMahan as The Pupa: An infant alien linked with the titular Solar Opposites who will one day evolve into its true form and terraform the Earth into a copy of the Shlorp homeworld for the Shlorp ruling class, using the data stored in its DNA and change colors like yellow, orange, purple, and light blue.Mary Mack as Jesse: Terry's replicant who is generally kind and wants to fit into human society.He shrinks random people to add to his terrarium, "The Wall". Sean Giambrone as Yumyulack: Korvo's replicant who is a self-proclaimed scientist and bounty hunter.Thomas Middleditch as Terry: Korvo's evacuation partner and Pupa specialist who enjoys being on Earth and is fascinated with human culture.He is the designated leader of their mission to find a new world. Justin Roiland as Korvo: an intelligent alien scientist who hates Earth and wants to leave as soon as possible.They disagree on whether this is awful or awesome." A parallel storyline follows a society of humans shrunk by the replicant Yumyulack and imprisoned in a terrarium known as "The Wall". Solar Opposites "centers around a family of aliens from a better world who must take refuge in middle America.
