A Million Little Things 4x20 "Just in Case" Season 4 Episode 20 Promo (Season Finale) - The strength of Maggie and Gary’s relationship is put to the test once again. Rome makes a sacrifice for a student in distress; Theo turns to an unlikely source to help his mom through a rough patch, and Eddie learns a shocking secret about Anna on the season finale of “A Million Little Things,” airing Wednesday, May 18th on ABC. Watch episodes on demand and on Hulu the day following their premieres.