Callie, a 16-year-old girl fresh out of juvenile hall, goes to live in the care of Lena and her partner Stef and their kids.
Stef Foster, a dedicated police officer, and her partner Lena Adams, a school vice principal, have built a close-knit, loving family with Stef's biological son from a previous marriage, Brandon, and their adopted twins, Mariana and Jesus. Their lives are disrupted in unexpected ways when Lena meets Callie, a hardened teen with an abusive past who has spent her life in and out of foster homes. Lena and Stef welcome Callie and her brother, Jude, into their home thinking it's just for a few weeks, until a more permanent placement can be found. But life has something else in store for the Fosters.
Callie, a 16-year-old girl fresh out of juvenile hall, goes to live in the care of Lena and her partner Stef and their kids.
Callie is accused of selling pills around school, and Lena and Stef decide not to punish Brandon which causes tension among the parents.
Mike asks Brandon to move in with him, and Jesus and Lexi continue to keep their relationship a secret from Mariana.
Everyone is celebrating Mariana's quinceanera, and the secret Jesus has been hiding comes to light, which causes tension between Mariana and Lexi.
Stef and Lena try to find time to work on their relationship, while Lexi and Jesus have to deal with the consequences of their actions.
Brandon has an audition for a sought after piano coach, while Jesus is invited to a church camp.
Lexi's parents punish her when they find out the truth about Lexi and Jesus.
Stef and Lena have dinner with Lena's ex.
Mariana and Jesus deal with the repercussions of their actions.
The Fosters are getting married, but Stef is not as involved as a stressed out Lena would like.
The family is impacted by Callie's decision to run away; Mariana learns the truth about Lexi's trip.
Callie meets a woman who works in the foster care system; Brandon reveals why Callie ran away.
Lena worries when Stef returns to work; Kelsey exposes secrets from Mariana's past.
Stef and Lena visit Callie; Jude must decide if he wants to be a part of the Foster family.
A family gathering brings Callie back into the Fosters' home for the first time since she ran away.
Callie hopes to earn back the trust of her loved ones; Stef is called to testify in Mike's case.
Callie's good deed creates trouble for a friend; Brandon makes a deal with an unsavory classmate.
Jesus is pressured to make a difficult choice; Callie is torn between protecting two friends.
Callie reunites with her father; Jesus struggles to keep focused at school without his medication.
Mariana and Jesus worry about dates as the Winter Ball approaches; Zac's mother visits Lena.
Stef and Mike deal with the fallout from a shocking revelation; Brandon makes another bad decision.
