The Fosters 4×20 “Until Tomorrow” Season 4 Episode 20 Sneak Peek (Season Finale) – Callie has 24 hours to decide if she should take a three-year plea deal in the spring finale episode of “The Fosters,” airing Tuesday, April 11th, on Freeform. Callie faces a life-changing decision to take a plea deal and go to jail for three years, or go to trial and risk an even longer sentence. Even though Callie struggles with her own situation, she tries to help Diamond out of hers which becomes extremely dangerous. With only 24 hours to make a difference in Callie’s case, Stef and Mike ramp up their investigation into the Martha Johnson murder bringing in as many leads as possible. Lena confronts Drew about his campaign to make a major change at Anchor Beach Community Charter School, while Mariana rallies her fellow students to protest. Meanwhile, Jesus starts to put together the pieces about Emma.