Patrick O'Connell

Don and Megan hunt for a former chemist who is thought to be tampering with over-the-counter medication, causing many people to suffer seizures.

Kara travels to the Fortress of Solitude to learn how to defeat Indigo, who has a connection to Kara's past. James and Lucy's relationship comes to a crossroads.

Jack and the team try to find a priest, Father Henry Stephens, who disappears from his church shortly after learning that he needs a liver transplant to survive. The search intensifies when a transplant organ becomes available, and there is only one day to find him before it goes to the next person.