In the season three premiere Mary (Zoe Perry) worries about Sheldon's mental health after Dr. Sturgis experiences a nervous breakdown.
The team tries to determine who is poisoning residents of a small town.
When the COVID-19 pandemic hits Seattle, the Station 19 crew lean on each other for support; Andy tries to make sense of her mother's return; a group of teenagers unintentionally starts a wild fire.
Vic rallies the crew to pose for a calendar photo shoot that will support a good cause; Emmett comes clean to Ben and Sullivan and shows Andy a softer side.
When Cloud 9 becomes an official polling place, corporate sends out a voting pamphlet that only benefits the company's interests, angering Amy and Jonah; Dina and Glenn are stuck in a cover-up as Mateo hides his undocumented status.