The Fosters are a bi-racial couple who are raising a biological son along with several other adoptive children. Lena is an altruistic school principal, who is determined to save children. She decides to take in Callie, a “troubled” teen with an abusive past whose ways will turn the family lives upside down. Stef is a tough yet kind police officer who isn’t as eager to add to their family. Lena tries to introduce new children to the family, not always with Stef’s knowledge.