A contemporary coming-of-age story about a girl who's trying to determine where she fits in. When her free-spirited older sister returns with a revelation that changes everything, it sends Andi on an uncharted course of self-discovery.
Cast:Peyton Elizabeth Lee , Joshua Rush , Sofia Wylie , Asher Angel , Lilan Bowden , Lauren Tom , Trent Garrett , Stoney Westmoreland , Emily Skinner , Luke Mullen , Garren Stitt , Darius Marcell , Anson Bagley , Chelsea Zhang , Jack Diamond , Bettina Kenney , Chloe Hurst , Molly Jackson
Andi's family life is thrown for a loop when her big sister Bex returns home on the eve of her 13th birthday. Bex arranges for Andi to learn a new sport with Jonah, the cutest guy at school and the captain of the Space Otters Frisbee team.
Andi grapples with telling her best friends Buffy and Cyrus some big news but is preoccupied making Jonah a bracelet, at his request. Cyrus becomes the official Enthusiastic Supporter of the Space Otters and helps them win their first game.
Against Celia's wishes, Bex convinces Andi to stay up late to watch a scary movie. When Andi falls asleep in class the next day, she receives detention and misses a Space Otters game. Meanwhile, Buffy joins the track team and wants to win.
Ham takes Celia on a weekend getaway, so Bex emboldens Andi to host her first-ever dance party at the house - and then Amber shows up, dampening Andi's big night.
Andi's frustration boils over when she discovers that Buffy has secretly been confiding in Bex instead of her. Meanwhile, Cyrus double-dates with Jonah Beck, Amber and her friend Iris.
Buffy and Cyrus convince Andi to tell Jonah the truth about Amber, but it leads to Andi feeling humiliated. Bex lets Andi stay home from school and they get an unexpected visitor.
Andi gets invited to go on a fun adventure, but overprotective Celia makes her go to school; Andi's glad she did because she finds out something important about Jonah and Amber.
Andi catches someone snooping through her laptop making her yearn for some time to herself. Meanwhile, Cyrus is challenged by a text from Jonah Beck and enlists Buffy's help.
When Jonah asks Andi for help picking out a birthday gift for his girlfriend, Amber, Andi enlists the help of Bex.
Andi and Bex struggle to get comfortable with their new living arrangement; Cyrus thinks Iris has dumped him so he enlists Buffy to fill in as his date.
Andi, Buffy, Cyrus and Gus enlist the help of Bex to start a protest against an unreasonable new dress code.
Jonah Beck turns to Andi after Amber fails to defend him to her friends; Andi is convinced Bex and Bowie are destined to be together.