Andi's world turns upside down when her older sister, Bex, returns home on her 13th birthday and reveals a family secret. Digitally released on March 10th 2017 ahead of the network premiere.

Andi's family life is thrown for a loop when her big sister, the freewheeling Bex, returns home on the eve of her 13th birthday. It begins with Bex arranging for Andi to train for Ultimate Frisbee with the cutest guy at school, Jonah Beck, who she learns has a high school age girlfriend, Amber. Andi also grapples with telling her best friends Buffy and Cyrus some big news, but is preoccupied making Jonah Beck a bracelet, at his request. Meanwhile, Cyrus becomes the Space Otters' official Enthusiastic Supporter and helps them win their first game. Digitally released on March 10th 2017 ahead of the network premiere.

Against Celia's wishes, Bex convinces Andi to stay up late to watch a scary movie; and when Andi falls asleep in class the next day, she receives detention and then misses the Space Otters game. Meanwhile, Buffy joins the track team and is determined to win. Digitally released on April 7th 2017 ahead of the network premiere.

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. Buffy meets Marty, a guy from the school track team.

Ham works to convince Bex to contact Bowie and tell him the truth; 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.

Bex encourages Andi to stand up for herself and challenge an unreasonable new dress code, so Andi, Buffy and Cyrus practice their newfound empowerment and start a protest.

Amber fails to defend Jonah Beck when her friends mock his Space Otters team, causing Jonah to turn to Andi. Meanwhile, Andi is convinced Bex and Bowie are destined to be together.