One Hundred (S05E12)

Annie embarks on an enigmatic cleaning spree while Eric receives alarming news about Mary fleeing from "The Colonel" to return home, prompted by a cunning plot with Robbie. In a panic, Eric believes more chaos is on the horizon and goes to extreme lengths to uncover the truth. Unbeknownst to him, Mary is actually on her way to throw a surprise birthday party for Eric, featuring guests whose lives he has positively impacted. Meanwhile, Ruthie stumbles upon Frankie and Johnny's baby, Mercy, at their doorstep. Lucy spends the day with her friend Mike's (guest-star Jeremy Lelliot) nearly catatonic mother, leading to a shocking revelation. Simultaneously, Matt and Simon try to piece together the mystery of delivering Mrs. Bink (guest-star Eileen Brennan) to the hospital.