The Fosters 4×10 “Collateral Damage” (Summer Finale) Sneak Peek – Mariana continues to push herself to the point of exhaustion while Callie’s efforts to help others bring conflict and danger, on the summer finale of The Fosters, airing Monday, August 29th, on Freeform, the new name for ABC Family. Callie and the family set up a ‘Justice for Jack’ booth at a music festival in order to gather signatures to stop Justina’s foster care bill, but Callie’s persistence in advocating for both Jack and Kyle lands her in a dangerous situation. Additionally, Callie’s efforts are sidelined when the tensions between her boyfriend AJ and her friend Aaron come to a head. Mariana, still taking Jesus’ ADHD prescription medication, sees Nick and runs away from the festival, sending the family into a frantic search for her. Meanwhile, Stef discovers that her inquiries into Kyle’s case will have repercussions at her job.