B.B. and Valerie attempt to amass support for an intervention. April’s assets face deportation. A dangerous figure invites Hector and Torres into dangerous territory.

Lucille treats an elderly hoarder (Annette Crosbie) suffering from a malodorous leg ulcer, and fears that living surrounded by towering piles of rubbish, books and tins of food will have a serious effect on her recovery. Sister Hilda has a challenging case on her hands when a family newly arrived from Ghana are found to be suffering from an unidentified illness, and Violet runs for a place on the local council, but Fred is not convinced she can make a difference to the community, placing more faith in the Civil Defence Corps.

While spending time away from the city in his RV, The Guy gets upsetting news, but makes an intriguing new connection. Cori, meanwhile, tries to adjust to a new reality without her friend.

Brianna confronts a violent figure from her past in an attempt to cope with her trauma. Roger befriends a fellow captive and endeavors to escape the Mohawk Village. Fergus and Marsali plan a dangerous mission.

Executive Producers/Writers Toni Graphia and Matthew B. Roberts reveal more about episode 412: "Providence".

Fiona's downward spiral continues and Debbie steps in to pick up the slack at the Gallagher house. Ingrid ropes Frank into fulfilling her lifelong dream. Tami shows Lip a different version of adulthood.

Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl’s true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives.

Hays recalls his early romance with Amelia, as well as some cracks in their relationship that surfaced after they married and had children. Ten years after the Purcell crimes took place, new evidence emerges, giving Hays a second chance to vindicate himself and the investigation.